Ray Optics 13 : Critical Angle and Total Internal Reflection - TIR - JEE/NEET

[@PhysicsWallah]

Live Classes, Video Lectures, Test Series, Lecturewise notes, topicwise DPP, dynamic Exercise and much more on Physicswallah App. Download the App from Google Playstore ( bit.ly/2SHIPW6 ) Physicswallah Instagram Handle : instagram.com/physicswallah/ Physicswallah Facebook Page: facebook.com/physicswallah Physicswallah Twitter Account : twitter.com/PhysicswallahAP?s=20 Physicswallah App on Google Play Store : bit.ly/2SHIPW6 Physicswallah Website: physicswallahalakhpandey.com/ LAKSHYA Batch(2020-21) Join the Batch on Physicswallah App bit.ly/2SHIPW6 Registration Open!!!! What will you get in the Lakshya Batch? 1) Complete Class 12th + JEE Mains/ NEET syllabus - Targeting 95% in Board Exams and Selection in JEE MAINS / NEET with a Strong Score under Direct Guidance of Alakh Pandey. 2)Live Classes and recorded Video Lectures (New, different from those on KZbin) 3)PDF Notes of each class. 4)DPP: Daily Practice Problems with each class having 10 questions based on the class of JEE Mains/NEET level. 5)Syllabus Completion by end of January, 2021 with topicwise discussion of Last 10 Years Problems in Boards, JEE Mains/NEET within Lecture. 6)The Complete Course (Video Lectures, PDF Notes, any other Study Material) will be accessible to all the students untill JEE Mains & NEET 2021 (nearly May 2021) 7)In case you missed a live class, you can see its recording. 8)You can view the videos any number of times. 9)Each chapter will be discussed in detail with all concepts and numericals 10)Chapterwise Approach towards JEE Mains/ NEET & Board Exams. ****Test Series for XI & XII**** We provide you the best test series for Class XI,XII, JEE, NEET chapterwise, which will be scheduled for whole year. The test series follows very logical sequence of Basic to Advance questions.& Evaluation of Test and Solution to all the questions at the end of the test. ========================================================= For PDF Notes and best Assignments visit @ physicswallahalakhpandey.com/ Follow us on: Instagram instagram.com/physicswallah/ Facebook: facebook.com/physicswallah =========================================================== 12th Chapter 9 : Ray Optics 01 : Introduction & Reflection in a Plane Mirror JEE /NEET kzbin.info/www/bejne/lZ-qi3qlacx7fdE Ray Optics 02 : Number of Images formeed by Two Plane Mirrors JEE/NEET kzbin.info/www/bejne/rn2wd6yOjbqZitU Ray Optics 03 : Velocity in Plane Mirror - Velocity of Object & Velocity of Image JEE/NEET kzbin.info/www/bejne/Y6vNqJ-cZtiDqrM Ray Optics 04 : Spherical Mirrors: Introduction :Focus ,Focal Length & Focal Plane - Sign Convention kzbin.info/www/bejne/hJWtdpeeaN12aLs Ray Optics 05 : Image Formation by Concave & Convex Mirror for Different Position of Object JEE/NEET kzbin.info/www/bejne/n3awgaWnmayDg7c Ray Optics 06 : Mirror's Formula -Derivation for Concave & Convex Mirror +Basic Numericals + Concept kzbin.info/www/bejne/mITbiKunm818j6c Ray Optics 07 : Magnification - Magnification & Mirror's Formula Best Numericals JEE/NEET kzbin.info/www/bejne/hmPTfXeGn5J3jc0 Ray Optics 08 : Combination Of Mirrors - Concept of Virtual Object JEE /NEET kzbin.info/www/bejne/fX2lq6SnpciFfJY Ray Optics 09 : Velocity in Spherical Mirrors - Velocity Of Object & Velocity Of Image JEE/NEET kzbin.info/www/bejne/f3mvYaWul7WKgNE Ray Optics 10 : Refraction Of Light : Snell's Law & Refractive Index JEE/NEET kzbin.info/www/bejne/jJrQipqYiNxlbsk Ray Optics 11 : Real Depth and Apparent Depth - Complete Concept with Best Numericals JEE/NEET kzbin.info/www/bejne/qIbMkJaercmSp6c Ray Optics 12 : Refraction - Shift through a Glass Slab : JEE/NEET kzbin.info/www/bejne/Z2mni6t8gtGBp6c Ray Optics 13 : Critical Angle and Total Internal Reflection - TIR - JEE/NEET kzbin.info/www/bejne/fXrZZIOEbtuWiJo Ray Optics 14 : Refraction through Prism : Concept , Numericals & Minimum Deviation Case JEE/NEET kzbin.info/www/bejne/ep-mZmCdgp1kp8U Ray Optics 15 : Refraction from Spherical Surfaces - Formula - Derivation and Numericals JEE/NEET kzbin.info/www/bejne/iYvQYX6Cqrejgas Ray Optics 16 : Lens - Introduction : It's Types , Optical Centre , Focus , Focal Length JEE/NEET kzbin.info/www/bejne/Y3ycqqibfL9opqs Ray Optics 17 :Image Formation By Convex and Concave Lens for different Positions of Object JEE/NEET kzbin.info/www/bejne/oHulZaWlmJqhaKc Ray Optics 18 : Lens Maker's Formula - Derivtion and All Types of Numericals JEE/NEET kzbin.info/www/bejne/gYqrpWh6rd-Ua7s Ray Optics 19 : Magnification - Magnification & Len's Formula with Best Numericals JEE/NEET kzbin.info/www/bejne/lXbCZ3iZdpt-qJY Ray Optics 20 : Combination of thin lenses in Contact II Cutting Of Lenses II Power - JEE/NEET kzbin.info/www/bejne/bpqUkK13aJhphsU Ray Optics 21 : Silvering Of One Surface Of Lens - Silvered Lens JEE/NEET kzbin.info/www/bejne/aZa7ZmV6Ypx6bpI Ray Optics 22 : Microscope - Simple Microscope & Compound Microscope - JEE/NEET kzbin.info/www/bejne/Y4KsqZyjrMl-j6s Ray Optics 23 : Telescope - Refracting Telescope & Reflecting Telescope JEE/NEET kzbin.info/www/bejne/pGnRdHp3nJh0q7c

[@sadatpur-218shriramcolony7]

Sir one doubt Please explain that don't we have taken the area of the cone 50:00

[@challengex8401]

@@sadatpur-218shriramcolony7 lekin bhai cone ka area nikalkr kya fayda hai???

[@challengex8401]

@@sadatpur-218shriramcolony7 jbki circle ke area nikalne ka fayda b hai

[@kuriouskid1285]

38:40 sir ghanti band krne gaye the kya?

[@madhurjyasaud159]

At 30:50 sir mentioned that critical angle of rarer medium is 42° and in that way there will be grazing emergence .... but when sir did the solution...sir took 42° of glass Can anyone explain?

[@TRENDwaves69]

4 years later ......still worth it ... better than many new KZbin video explanations

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Real

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Agreed

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Yes

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Aayein 🍆

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Agreed bro

[@heartlessshe8438]

One of the most unnoticed talent of alakh sir is his drawing skills being a pcm student i know how bad wemake diagrams infact our teachers there diagrams sometime are worse than us but alakh sir making perfect circle and drawing a straight line in single attempt is literally remarkable ...

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Fr

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Physics wallah is directly proportional to feel in physics and cuha khana remains constant

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Nadiya bhai

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Galat where chuha khana is not constant 😂

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Chuha*

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@@SS-oo8sj see previous yrs paper,,,,then tell,,,,if unacademy is better then go n watch unacademy n,,,,,why wasting time

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@@SS-oo8sj if you don't like his lectures... don't compare atleast.. whatever he is doing is at par upto JEE main.. and other than this...his explanations are better than any other...

[@niranjanprajapati1625]

Chl nikl

[@mahanandapaul602]

@@SS-oo8sj fully Ulta Bhai Alakh sir sabse achha jee advance and mains ka teacher hai and jee ko hi ziada focus karta hai sir

[@i-Sensei-XII]

Sir kbhi kbhi sochta hu agr aap nhi hote toh ky hota ,Aisa sochne p bhi man kharab ho jata .Sir apki ye videos na sirf humare seniors , hme , or humare aane wale pta nhi kitne juniors ko serve krne wali hae. A very big thank you from all your pyaare baccho❤️

[@Manoj_gautam_]

Sir ke lectures bina earphone ke dekhna is too dangerous😂😂 aesi feeling to class m bhi nahi aa skti " Best teacher "

[@somduttyadav134]

Bilkul 🤣🤣

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Bhai hum to kabhi earphone hi nahi use karte😂😂😂

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Tumhara jee nikla ?

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hn yrr

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yes family members bolte hai ki ye teacher to singing b karte hai

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HUGE RESPECT AND LOVE …. BEST TEACHER IN THE WORLD .

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chuha Mt kho Bhai

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@@devanshop2004 .

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No doubt best but In world🙄

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Teacher log bhi padh rahe hai kya!

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Sir your lecture are making my quarintine worth remembring

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quarintine?....remembring?

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Yarr...pure teachers inke jaise padhane lage tab.....toh...padhne k alaba koi kaam m mann nhi lgta😂😂👍👍😅♥️...best teacher ever...no one will replace him 🙃❤️

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Shi bat hai yrr

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Sahi baat hai

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TIR is just like: JO BHEJI THI DUA WO JAKE AANSAMAN SE YUH TAKRA GAYI KE AAGYI HAI LAUT K SADA😂😂😂😂😂😂😂😂

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U are genius😅😅

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1:00:18 ,🤣🤣 Sir kasam se aap jaise physics teacher agar mere school mein hote to pure din physics padhta🤣

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@@s0umyendustudies han mere Bhai , itna ameer bano ki chaaro taraf ladkiyo se bhar jaao

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Aapne sahi kha even it applies to boyz as well

[@duggu8360]

मेरे जैसे हिंदी मीडियम वाले बच्चे 1:02:55 पर प्रतिबिंब सुनकर बहुत खुश हुए होंगे(दो साल बाद हिंदी वर्ड सुना है हमने physics में, वरना हम तो भूल ही गए थे कि sir english medium के लिए पढ़ाते हैं पर sir ने कभी फील ही नही होने दिया कि हमारा मीडियम अलग हैं )😀 अब तो मेरी क्लास के बच्चे कहते है की तू पहले इंग्लिश मीडियम में पढ़ता था क्या जो फिजिक्स इतनी आसानी से समझ आती है तुझे, और वो भी इंग्लिश में 😊

[@PWians]

7:20

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Ken kaneki

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10:33 The way he laughs 😂😂😂,,,makes us laughs even more

[@shilpaparanjpe8018]

Sir in class 11 ionic equilibrium video u said that by singing songs some parents doubt ur character.... But in my house every morning i am wished by my parents " hello bachhoooo" and they also sing songs while u sing... U r the best teacher sir....

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Thank you.. those who liked the comment

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Kash hamare parents bhi aise hote

[@calyx69.69]

I've never commented on any of your videos. But, today I sincerely wanna thank you for your insane dedication towards teaching u legitimately explain every topic in a marvelous way that it gets set inside mind. I was never a "studious" kinda student and even if I try to study and try to solve the numericals I couldn't. Sometimes I used to leave them by looking at the length of question. But today I can actually solve many questions. I ain't saying I can solve every question out there but yeah, I've improved a lot in physics. Heartily thankful of you sir 🥺🖤

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Me two 🥺

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Issey axa to mat hi cmmnt kr bhai😶😶

[@deepanshugupta9259]

That prism question gave me the feel of working of the Periscope automatically!!!! Such a great Teacher.

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Anyone 2025 aspirant?

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Bro 🫱🏼‍🫲🏻🙌

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Bro I'm 2027 aspirant lol

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Me

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Yes bto

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​@@Varshith-cr2ed Same here bro, preparing for NSEP.

[@I3havs]

1:02:42😂😂 Loved the session as always 🔥🔥

[@I3havs]

MIRAGE FORMATION and OPTICAL FIBRE part was really helpful for ICSE 10TH❣️.....and rest of the video I shall watch in my class 12th....☺️

[@tanumishra4547]

Sir your efforts are speechless Thnx for being in our life

[@Nyalkaranshi_Podcast]

Optical fibre pe rays bending ko glt bataya

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Abki bar mene puri tuition ki fees bachai ( because I have full believe in physics Walla) 👩‍🎓👩‍🎓👩‍🎓👩‍🎓👩‍🎓👩‍🎓🏅🏅🏅🏅LOVE sir

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Great now you are a part of revolution of Alakh Sir .

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And I have full believe you have saved it to waste somewhere else. May be on your stupid soul

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@@nirmalpathak2815 what do u mean???

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@@nirmalpathak2815 do u mean that studying here is stupidity???....Idiot....go waste time on Byju's and other institutions.....

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@@LUFFY___SMT sarcasm samjho wo gf bol rha hai uska Atma matlab pyar

[@dasarineha1263]

42:15 ...beautiful concept 🤩🤩🤩

[@dadhaktipanktiyaan5828]

56:17 -perfect definition of Mirage 😁😁

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how many students agree that pandey sir is our E-GURU👍👍👍❓❓❓❓❔❔❔❔❔‼‼‼‼⁉⁉⁉⁉⁉⁉

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Sir you deserves huge huge huge respect from all students who are able to seeing your video. Sir a great thanks to you for this wonderful and strong support for students .

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PHYSICS WALLAH IS LOVE WHICH ONE CAN FEEL LOTS OF LOVE FRM KASHMIR SIR💓💓💕💕💕💕💕💕

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Yr merko to Alakh sir ke elava kisi ki physics smjh hi nhi ati ❤❤❤All the best guys for physics exam (4 march 2024)

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riyal

[@zorouchiha6397]

56:00 to 56:40 sir ne to hamari ankhe khol de 😂😜

[@0Rahul__Gupta]

sir you make me fall in love with physics

[@rajbadkhal1428]

i am in IIT KHARAGPUR because of you. i am heartly thanks to sir, you are real hero.SIR keep it up ....GOD BLESS YOU SIR....

[@adorablestudy6896]

You only studied from this channel........ ???

[@mr.victory.]

Whaat!!

[@nevilledope4030]

@@adorablestudy6896 he's lying bruhh- why would he even tell him that in this video?...like ofc

[@saiaditya8594]

@@nevilledope4030 why not?

[@nevilledope4030]

@@saiaditya8594 why not? He could have written this in his first or last or maybe some special video...but he wrote it in the 13th part of ray optics lol

[@modynaute]

1:13:19 i like this new style padhai karte rahiye all the very best

[@harshrana3012]

Who is here after useless classes of school?

[@ekta2416]

Mee

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Me

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Mee

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school no 12th is of college

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Mai to liya hi nahi bhayi😂mai July se hi yahi hoon

[@derekrajsingh4310]

Study is so much fun with you. You are my inspiration. Love you sir❤️

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Right sir your physics is 💯

[@pradeeshadithya3641]

NOTE TO TEACHERS: Learn from him and teach us. So we will pay 100% attention to your teaching as we did while watching this lecture

[@studyproof1176]

Love from bihar and from whole world is with you

[@vanshita44]

after watching a lot of new vdos.. coming back here b like.. sr aapke looks change ho gye hn thode... backboard.. shirt... marker... duster.. sb badal gya... the thing that's still constant is the way of teaching... kutuk.. is constant.. your beta is constant... in the end.. physics constants are also constant... just like you... hope I could meet uh once... at least once in a lifetime...🙂

[@jatinmittal6434]

✌

[@aqibwithsinging52]

Arey " Hello bechho " Is also constant... Alakh sir is love....

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Yaar tumne 2 mahine pehlee complete karliya, mtlb tumhara syllabus complete hone wala hoga, mujhe suggestion chahiye tha

[@payalsahani4666]

Others- light straight n jakr bend ho jaegi Alakh sir- furr n jakr turr jaegi😂

[@binodshrestha2850]

i didn't understand what my college teacher taught in the college but with the help of you i can do the thousands of numerical problems. thank u so much sir for teaching us. congratulation sir for 2 million subscribers

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तुम नेपाली हो !! कहासे हो हम सप्तरी से है भाई !!

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Even The graduates of IIT and NIT aren't able to explain like you sir. u r more than IIT💯✌👍🙏 Thank yo sir!!!

[@adityakumarixc1784]

42:18 alakh sir's legend dance

[@kamalrautela9694]

1:13:23 agla lecture prism ka 😍 no one works as hard as our sir 😊

[@mechanicalscorner6372]

Sir ko shiksha ke kshetra ka sarvocch national award milna chahiye. Who is agree please like.

[@jeevannayak246]

Aur wo tum lake dena

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shiksha mantri banana chahiye

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IMPROVE YOUR ENGLISH FIRST......'WHO IS AGREE" LOL!!!!!!

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@@anuragkhare8707 First u improve Your's Who has only single inverted comma😂🤣😂🤣

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@@sujatasawant2805 Hasna hai kya?

[@shalvisharma5052]

Sir happy teachers' day ....💛💛🎊🎊 Pta nhi ye comment aapko milega bbi ki nhi kyunki ye video purana h na .... But wish to krna hi h hmare best teacher ko 🙏 Sir ...we love u ..😀.wr respect you ... Thanku so muchhhhhhhhh♥️♥️

[@dipanshusharma7680]

Hello

[@zyncc]

Alakh Sir should be the teacher of teachers

[@galactuscodm4559]

True

[@dishankmishra8291]

yes sir optical fibres are in the form of video and audio video:- in our tv HDMI cables (high definition multimedia interference) audio:- we have optical cables in our sound receivers which gives us 5.1 or 7.1 or Dolby Atmos surround sound sir, you are really a great person we are blessed to have a teacher like you sir.thank you very much sir for explaining this topic in such an easy way.i will be always thankful to you sir

[@DevoteeFilms]

This lecture also completed 👌💯😊

[@hussnainmir5532]

Amazing, Amazing, Amazing, Amazing, Amazing, Amazing, Amazing Sirrrrrrr. Today I am regretting why I have not seen your videos before....... I think it's too late for me. But still I will try my best....... Lots of respect and love Sir 💗

[@zigzag9818]

Pahle kahan se dekhte the bhai

[@sumit4602]

Thanks sir 👍👍👍👍👍

[@Saksham-f1w]

38:57- circle of illumination

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Best teacher in 21th generation💯🔥💥💢,how many of u agree........

[@pragatibora2088]

💯

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Main 11th mein hoon,isiliye bina dekhe vedio like krke jaarhi hu❤❤😇🙏 You are hope for us😇

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Thanks for supporting so

[@midhun.m4963]

You are soo lucky to see PW in 11th

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You are so lucky because you can watch 12 class lecture in 11 class.

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aap behan ho ya bhai conform to karlo

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@@midhun.m4963 right

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U r Like God of teaching...👌👌👌🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🌹🖤🖤🖤🖤

[@sanjana3462]

42:37 if you want to see alakh sir do classical dance

[@mallikarai6985]

Good observation

[@hardikgodara3612]

+S A N J A N A are u indian or american

[@utkarshdwivedi2942]

Maine bhi yhi comment KRNE vala tha for search Kiya to tumhara mill gya😚😂

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@@mallikarai6985 hii

[@Thephysicsplace]

At 1 hr 3 min wat I can see is he is teaching mirage totally wrong. Mirage is not becoz of Tir

[@Supersongultimate]

I was watching ur old video on this topic and suddenly i see the notification of this 😁😄😄 Also Alakh sir , thanku so much for making physics interesting 😄😄

[@ayanalam9685]

Physics wallah = love 💕 in physics where love 💕 is constant and subjects changes like also chemistry

[@jagjitsingh-zo3bd]

Ye school k teachers hi hain jo dislike maarte hain🤣

[@abilitbit]

Sahi. 😆😆😆

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Aur institute wale bhi😂😂

[@medic_planet_]

Hn or coaching wale bhi 😂

[@muskanpandey8747]

@@garimaahirwar3933 shi kha aapne ....hm ase kisiko abuse ni kr skte ...or tb to bilkul.v ni jb wo insaan 1 teacher ho

[@aanchalshukla7022]

🤣😂😅

[@aniruddhahazra2196]

30:01 "Sir ekbar mobile check karlu" I was really gonna check my phone then😂

[@kartikbakshi7540]

😆😆

[@aabhagupta5611]

You are d best sir♥️♥️please never leave us alone...u r d only one who teaches physics best than anyone else in this world..♥️

[@navyarao7643]

13, 15, 16, 17, 18, 19, 20~great videos im gonna sit and watch today :)

[@sureshmeshram3342]

no word in this entire world can describe Alakh Sir! extreme huge respect! i repeat extreme huge respect!!!

[@prathamwaykole3070]

App jaisa physics teacher ho to physics se bhi darr na lage ... Ur way is unique sir aur kabhi meet up rakho sir kidhar toh ham qurantine phodke apke liye .......

[@Raviraj-sm2pv]

Note that bell ringing starts at 37:17 🔔🔔🔔😁😁😁

[@mukeshsaha9738]

Alak sir one of the Best teacher in asia and most respectful person we all students support alak sir to grow more and more

[@GautamKumar-ip6sj]

Great teacher best teaching expression🌻🌻

[@pratikprakhar8417]

😍 Aaj Jake mera ye concept clr hua😅 thankyou sir

[@shatakshiupadhyay5217]

It's seriously the best lecture on Total Internal Reflection

[@shivanshverma4919]

Very realistic and funny explanation of mirrage😂😅

[@yashsharma1941]

Hello bachoooooooooooooooo this line spread energy in us

[@ashifaperween1269]

U r great sir Wave optic ka video bnayie sir please

[@Lets_coding.]

Mirage to meine pehli baar Doraemon mei dekha tha😂😂 Muje lgta tha ki wo ek imagine tha Pr aj pta chala ki wo ek concept tha

[@AnkitRaj-yt8ce]

Sir, you explain very well! I and many of our friends visit your lecture. I understand all your lecture very easily.I am your big Fan sir.

[@vivekshukla928]

Sir please differentiate between TIR and internal reflection and which one is responsible for the rainbow formation.

[@kamaldeosingh3798]

Rainbow =internal reflection B

[@Kounser-bk8bv]

Sir u r always best teacher ❤❤❤

[@FaizanAli-pu1qc]

Chalo sab mil kar alakh sir ko ek din trending le hi aate hai sab ek like karo🥳🥳🥳

[@tejassalunkheofficial]

Upar chota U or Niche Bada U Koi puche ki, Kaha se sikha to bolna physics wallah se sikha 😂😂❤️❤️🔥

[@Anandkumar-pr5sp]

Sir you best of the best...I just love your teaching...🥰🥰....agr Sare teachers aap Jaise ho jayen to duniya me Kisi bacche ko koi dought hi na ho.😒😒😒...chalo hatao kya krna aap to h hi..🥰🥰

[@swamyvanji2960]

This is a perfect video to revise 🤗every single point with crystal clear explanation thanks sir👍💯🧡

[@shaliniyadav1665]

Bro is pw enough for neet physics like does it contains every concepts needed for neet .coz i wanna cover my backlogs pls reply

[@deepeshkumarsabnani]

@@shaliniyadav1665 yes... it's 💯% sufficient

[@ArjunKumar_01]

Ab jald hi 2 Million ki family hone waali h 😎 and congretulations Sir for New White Board... Aap hamare liye itna sab kuch kar rahe h ... Dil se Dhanyawaad Sir ji ...🙏🏻😇🙏🏻

[@sujalchede3928]

Did u manage to crack ur exam?

[@Ritunj_Gupta]

2 se 12 ho gye abb 😂

[@Transperency]

Happy teacher's day sir❤you are my only best teacher ever

[@125deepshikhamaths5]

Yehh ....aa gya new lecture

[@suhanikrishna6695]

Thanku sir for making all the concepts crystal clear☺️

[@mohdfaizan8023]

It's just all about ..Wallah wallah...... Amazing

[@indRaneeee]

Thank you Sir :) (Just felt like thanking you at the end of the class) ❤

[@kaanuveneekannada]

No matter night or early morning we are always awake sir , because we are your students 😍😍😍😁

[@dipteshsahoo744]

Thnk u sir 🙏🏻🙏🏻🙏🏻

[@harshpathak4270]

No words to descirbe the tremendous way of your teaching and concept bulding

[@aabhagupta5611]

Heartfelt thanks to uh sir❣️❣️

[@Stclassesonline]

Fabulous concept sir.....! Circle of illumination

[@_divyesh_2644]

7:33 *Instant Motivation*

[@anu_jimin1074]

Yess😂😑😥

[@anupcdy8851]

He is too funny 😁 I always listen his jokes twice thrice going back 10 sec.. Best teacher ever ❤️

[@SANDEEPKUMAR-gi5xx]

Best lecture h sir 😊 pura doubt clear ho gya😀👌👌👌👌👌🎉🎉🎉😎😎😎😎👌👌👌🥳🥳🥳🥳👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌

[@SujitKumar-kr1bw]

Thanks for working so hard for us sir😘😘

[@rudrarathi3150]

we all have to support alakh sir becoz no other teacher in the youtube made such content if some teachers make these type of content they had make a bussiness soo all students those who are watching this leacture do the paytm to alakh sir

[@dineshgupta8778]

Sir aapki wajah se mera circle of illumination clear ho gaya hai..thanku so much..mujhe kai dino se isme problem ho rahi thi, mere se iske numerical bhi nahi ho rahe the but ab ho jaa rahe hai..once again thanku so much...😀😀😀😀😀sir is pandemic corona ke time pe aap hi ki videos ke through hamare concepts clear ho rahe hai varna school ki online studies to....mashallah..😒😒😒

[@abhishekgaur664]

Huge Respect ,love and may God bless you always sir

[@nityaaaw2381]

thanking optical fibres for being able to provide this amazing channel to us

[@dinanathsingh2501]

Bhai abhi Optical Fibre introduced Nahin hua it is so costly abhi normal se kam chalta hai

[@SDGAMERYT1234]

@@dinanathsingh2501 kaisi baat krte ho jio fiber single optical fibre use karta hai same for airtel Xstream fiber

[@amazingworld6549]

Kuch bhi 😅😅😅😅😅😅😂😂😂😂😂😂😂

[@x-d44venkateshsanotshzapka43]

thank u sir