Optical Instruments | REVISION in 20 min | Microscope & Telescope | Resolving Power | JEE Physics

[@mohitgoenka99]

At 13:04 in the bracket it should be (1 + fe/D) and not (1 + D/fe). Thanx @aman for pointing it out. *Revision Video Links* Unit & Dimensions kzbin.info/www/bejne/rZXHXqqij6tnfs0 Error Analysis kzbin.info/www/bejne/d3awpHuLiqaia9U Vernier Caliper kzbin.info/www/bejne/pofSf2NqasmJbqs Screw Gauge kzbin.info/www/bejne/nYrHY4Oqor9jo9k Kinematics_Motion in 1d kzbin.info/www/bejne/i2Wxf6t8lqufn6c Kinematics_Motion in 2d kzbin.info/www/bejne/apC9oGiNnbKZbdk Relative in 2D- Rain Man Problems kzbin.info/www/bejne/iWW6nmh9ec-hes0 Relative in 2D- River-Swimmer Problems kzbin.info/www/bejne/e3ObYpl5e9Zlibc Laws of Motion kzbin.info/www/bejne/bXvPg2udg7eEf9U Friction kzbin.info/www/bejne/iJ-Uk3-pqZyYfc0 Work Energy Power kzbin.info/www/bejne/oZvViaJ7YtB3f5o Circular Motion kzbin.info/www/bejne/gZ-pqqCBfdGeipI Banking of Roads kzbin.info/www/bejne/jZPHlISPrJtmrsU Centre of Mass kzbin.info/www/bejne/l5XWZGiIgKlpZ5o Cons of Momentum & Collision kzbin.info/www/bejne/aZeTpmeCYtGsr9k Rotational Motion_Part 1 kzbin.info/www/bejne/hWfNYqCCpZVpjqs Rotational Motion_Part 2 kzbin.info/www/bejne/hXnRmmR6h8mZd7M Rotational Motion_Part 3 kzbin.info/www/bejne/p6bKeqScjrd2qM0 Gravitation kzbin.info/www/bejne/qHLNY5urgbuUe80 Properties of Solids kzbin.info/www/bejne/nYS7qZ2hbZ6flcU Fluids Statics (Part 1) kzbin.info/www/bejne/iHeuqWx4bt6iaa8 Fluid Dynamics (Part 2) kzbin.info/www/bejne/j2iUaKmHpbp4gLM Fluid Properties (Part 3) kzbin.info/www/bejne/jGnbhoqNgJeiipI Simple Harmonic Motion kzbin.info/www/bejne/iHrFaKKcg6xjb6s Damped Oscillation kzbin.info/www/bejne/sGqcY4WMq9mGnrM Thermal Properties (Thermal Expansion & Caloreimetry) kzbin.info/www/bejne/hYrNm6yGft-Xmqc Heat Transfer kzbin.info/www/bejne/hqqxk6J-nNmMsK8 KTG kzbin.info/www/bejne/joCUpal8na6UZqs Thermodynamics kzbin.info/www/bejne/n6vCnJlnn7d3iNk String Waves (Part-1) kzbin.info/www/bejne/o4u6f6B-Zp6qerM String Waves (Part-2) kzbin.info/www/bejne/hnWqomeaaN10bMU Beat Frequency kzbin.info/www/bejne/joTGfGampdugoaM Wave Motion -Organ Pipes and Resonance Tube kzbin.info/www/bejne/nHOaoZmAbJytl5o Wave Motion - Doppler's Effect kzbin.info/www/bejne/b16lqYKXltKhrck Electrostatics kzbin.info/www/bejne/aaTXiZV9h7KWqM0 Capacitors kzbin.info/www/bejne/e4mompyZoLOIobs Current Electricity kzbin.info/www/bejne/nZ6bd4icn9eLZ5o Potentiometer kzbin.info/www/bejne/mIWrgYKKgcmUna8 Moving Charges and Magnetic Effect of Current kzbin.info/www/bejne/i32nY4KhZqh6gM0 Earth's Magnetism kzbin.info/www/bejne/l2WmhWiri9x0gZY Magnetic Properties kzbin.info/www/bejne/bGTGqJePjbOfj6c EMI kzbin.info/www/bejne/pqa5kqmjlKx5iK8 Alternating Current kzbin.info/www/bejne/bWXHhYxjpd-AldE Ray Optics kzbin.info/www/bejne/eJnRqoeNr66feKM Wave Optics Part 1_Interference kzbin.info/www/bejne/gniYn597bb2Hm6s Wave Optics Part 2_Diffraction_Polarization kzbin.info/www/bejne/r56wqqyAfKykpLs Doppler Effect in Light kzbin.info/www/bejne/f3PZfnuJqp5mars Optical Instruments kzbin.info/www/bejne/hYLWpJV6fZV0aqs Electromagnetic Waves kzbin.info/www/bejne/mJS5iZp7oN6EkLs Semiconductors_Basics + Zener Diode kzbin.info/www/bejne/lXKVe6Kjhpxga5I Semiconductors_Transistors kzbin.info/www/bejne/pqSnqJ9uabOtmJI Semiconductors_Logic Gates kzbin.info/www/bejne/povHgnSwgcd5itE Communication Systems kzbin.info/www/bejne/bn_KfqSBbr1qb7s Modern Physics_Part 1_Atomic Physics kzbin.info/www/bejne/b4euhqF7aNKjfs0 Modern Physics_Part 2_Photoelectric Effect kzbin.info/www/bejne/aGXShYSmbZmdqM0 Modern Physics_Part 3_Dual Nature of Light kzbin.info/www/bejne/ZqvSg5KplrJ0h7s Modern Physics_Part 4_Radioactivity kzbin.info/www/bejne/d5W7ZIx4nbaspck Modern Physics_Part 5_Nuclear Physics kzbin.info/www/bejne/jHW6oomXnaycrsU Modern Physics_Part 6_X Rays kzbin.info/www/bejne/moSriZewjZyBjpI

[@anitabhagwati7517]

Sir plzzz chemistry ke liye apke jaisa koi channel pata hai to bata dijiye

[@mohitgoenka99]

@@anitabhagwati7517 I really don't know about that.

[@Harsh-bs9pu]

Sir everywhere 1+f/D

[@prabhatmishras421]

@@Harsh-bs9pu bhai at all places?? Pls reply ASAP bro🙏😬

[@kshitijvispute6792]

@@prabhatmishras421 no only in refracting telescope pt

[@niyo9977]

8:20 do not worry about sign in these formulas put only the magnitude 19:40 beta is the half of the angle subtended by the aperture of lens at its focus 23:40 unless mentioned otherwise take magnification at D

[@vanitasrivastava9055]

human eye isnt included for jee 2023 right?

[@aman-hindu13]

@@vanitasrivastava9055 is it there or not

[@vanitasrivastava9055]

@@aman-hindu13 yeah it's not there.

[@priyanshiprajapati-ne2rd]

9:36 tyubleanth L= between two lenes distance ncert tyubleanth L=between two lenes distance-(fe+fo)

[@artbyanushi5262]

Right

[@prajapatipriyanshi1603]

Right

[@mohitpipaliya-vl2wh]

9:50 tyubleanth L= between two lenes distance in ncert tyubleanth L=between two lenes distance-(fe+fo)

[@artbyanushi5262]

Right

[@prajapatipriyanshi1603]

Right

[@shivanikhare9588]

Sir ek baat toh h Aap samaj gye ho ki "kar bhala so ho bhala" Itna selfless teacher ni dekha mne kahi. I am going to be with u till that time as well when there will be billions of subscribers. You r true Gem I found ❤️💝💝💝

[@mohitgoenka99]

thank you soo much for these beautiful words. It means a lot.

[@shivanikhare9588]

@@mohitgoenka99 It's all u deserve Even more than tha❤️❤️🙏🙏

[@aayush4915]

Sir aapka ye jo "Badhiya hai" 😂 bahut badhiya hai😂😂

[@kidsandbids]

😂

[@kamalnandwar]

😘😁😁

[@gamerap7431]

A c h a !!!!

[@raantas946]

2 intoooo??

[@Unknown-xe6ni]

*badiyannnn

[@Mr_gaurav007]

Human Eye - 1:42 Eye Defects - 3:50 Angular Size & Simple Microscope - 5:30 Compound Microscope - 9:12 Refracting Telescope - 13:00 Limit of Resolution & Resolving Power - 15:24 PYQs - 19:56

[@Kvr02]

Most wanted topic tq sir 🔥

[@mohitgoenka99]

welcome dear

[@SeemaSingh-su7qg]

Sir in Q4 , how do we know if we have to use L/fo (D/fe) or L/fo(1+D/fe) , i mean how to know whether final image is at infinity or at D ????

[@hardikjain-brb]

I was going to comment the same thing

[@hellokey6319]

they will mention if the image is formed at infinity or distant image then its L/f0(d/fe) since they didnt mention whereabouts of image he took at D

[@namanpadiyar09]

I had 0 idea about Optical instruments..But Now I have watched this video 4-5 times..Now I am good to go..Thank You

[@30nilaysasturkarxg82]

14:45 please check the formula for m for image at D... Its given incorrect I reckon. it shoud be: f0/fe [1+fe/D]

[@arghadeepbosu1194]

Thank you Mohit sir for this session. No I am fully prepared to score 80+ in physics this june attempt

[@mohitgoenka99]

Good 👍

[@Spirit365]

scored then ?

[@shivani_4248]

​@@Spirit365 hes' in lpu

[@sarthakbagg3177]

what was the score ?

[@deepanshgoswami8019]

​@@sarthakbagg3177 nahi batayega 😂

[@techmind5988]

Cleared the concept as always!! while True: print("Thanks Sir!")

[@mohitgoenka99]

Most welcome!

[@rono_5_dors]

Revision done ✔..... Now that's how you can revise Thank you soo much sir ❤

[@mohitgoenka99]

Most welcome 😊

[@target__iit]

𝐓𝐈𝐌𝐄𝐒𝐓𝐀𝐌𝐏𝐒 00:16 *Topic to be Covered* 01:43 *Human Eye* 03:53 *Eye Defects* 05:31 *Angular Size* 06:25 *Simple Microscope* 07:10 ⓐ Image at Near Point (D) 08:27 ⓑ Image at Far Point (∞) 09:13 *Compound Microscope* 11:47 For, fₒ

[@mohitgoenka99]

very good keep learning and solving

[@muditatater1839]

sir your content is just mind blowing , small videos with multiverse of concepts with best explaination.

[@dakshmishra5185]

Thank you sir... Is reflecting telescope important for jee mains......thank you once again for providing best notes

[@mohitgoenka99]

no dear

[@aryanaheriit-kgp5200]

bhaiiya perfect!!...saare concepts and formula aa gye..bas aise hi saare topics asap complete kigiye and july ke remaining soln bhi...love u... my saviour :)))

[@anuragkumar4624]

From last 3 attempts ,every time i revised this topic i feared from this topic, but now your lecture made me confident!! THANK u sir

[@mohitgoenka99]

Welcome dear

[@Aman-zf6ow]

Bhaiya in the case of refracting telescope the formula for image at D is wrong...in the bracket it should be (1 + fe/D)🧐🧐

[@mohitgoenka99]

Thank you soo much letting me know. I have made the correction in PDF Notes.

[@sanjaygoyal7319]

@@mohitgoenka99 and sir there will be minus sign there too

[@vanshsback8785]

@@sanjaygoyal7319 where will the minus sign be there?

[@replymeasapp]

@@vanshsback8785 there

[@vanshsback8785]

@@replymeasapp njice very informative

[@shivanikumari7393]

you are like angel 😇 thank u so much for quality content u are the best 👌

[@Karan_Singh14]

Sir "Badhiya sir" Thank you sir everything got clear in 20 min

[@50me0nee]

sir ye video kya...aapki to har 1 video se hume kuch n kuch seekhne ko milta hai...... THANK YOU FOR SUCH A WONDERFUL CONTENT SIR...!!!!

[@mohitgoenka99]

keep learning dear #learnlikeneverbefore

[@wannatravel8501]

This is for the very first time that I am understanding this complex topic very easily.

[@Harsh---__---say]

In ques no 4, at 23:43 why we use the formula of maximum magnification...like how do we came to know we have to use L/fo(1+D/fe) and not L/fo(D/fe)

[@rjrohan4145]

Same doubt

[@gr8gamer_]

@@rjrohan4145 because Fo is given not Fe

[@trickypediaajoychetry]

Waiting for semi and communi and also a single video for topic like time period ,beats ,colour codes etc in a single video😌

[@mohitgoenka99]

Beats: kzbin.info/www/bejne/joTGfGampdugoaM Color Code has been explained in Current Electricity revision video.

[@dhruvnimoria650]

Really you are providing a quality content to the students 😌

[@krishkumariitbhu]

Just studied this topic 3 days before my JEE Main examination. Feeling confident. Thanks, Sir ❤️

[@devueditsx]

How did it went ?

[@om9.8dclash81]

​@@devueditsxgo*

[@Ryujisaan]

We will never know

[@learn_with_rks]

23:42 sir how you decided that image will be at D in the 4th question sir please reply asap

[@jeeonemonthonly]

Same doubt Is that formula is general formula

[@tanmaysachan]

If nothing is mentioned then we have to assume that image is formed at D and solve the question according to that.

[@learn_with_rks]

@@tanmaysachan if it would be the case of normal adjustment then, as sir told to take normal adjustment as the default ?

[@aarushjain90]

​@ravikumarsrivastava1306 then at infinite

[@kiransuresh4445]

Tum to bade heavy driver ho bhai 😅🤣 Sara concept clear Kardiya sir thank u .......

[@vivekvishwakarma8954]

Pure do sal bahot teachers se padha lekin kbhi optical instrument ka question nhi hota tha . Aap se pdhte hi sb smjh gya upar k 5//5 sare pyq bn gye Confidence next lvl hua pehlk bar is topic me ❤️ Lots of love and respect for you sir

[@mohitgoenka99]

excellent dear keep learning

[@vishwastech]

Sir ek hi dil hai aap kitani bar jeetoge,❤️❤️❤️

[@shriramkripasindhu3246]

Thanks sir very very useful....... I lost confidence in physics.. apki wajah se ab lag raha hai achhe number aayenge 🙏🏻❤️

[@vladimirprotein3275]

14:45 Sir, here the formula for magnification for image at D should be fo/fe * (1 + fe/D) and not fo/fe * (1 + D/fe) right?

[@Krishna.1829]

12:07 i wasted my 1 hour struggling with that 2021 pyq were they made this assumption. litreally i was not able to find its reason anywhere. thanks alot sir

[@themubalion]

Your 1 hour is not wasted

[@hansipandey1579]

Just these 25 min and optical instrument aapki jholi me ❤🎉✨ edunitishtically concepts learned💘🫠

[@mohitgoenka99]

well done on completing it keep learning and solving

[@rahulahuja3686]

sir at 23:22 why we used near point formula , can we not use far point formula of compound microscope

[@nakshtraruhela7263]

नही भैया कुछ अलग तो नही सिखा लेकिन revise अच्छे से हो गया! Thank you!🙂

[@siya2836]

23:48 why we choose the formula of magnification for image at d and not for image at infinity because in question it wasn't mentioned

[@tanmaysachan]

If nothing is mentioned then we have to assume that image is formed at D and solve the question according to that.

[@siya2836]

@@tanmaysachan thank you

[@JEENimai]

amazing lecture sir learnt a lot new things

[@mohitgoenka99]

well done on completing it keep learning and solving

[@star-cm2ei]

Your videos and short and crisp and more importantly top notch in terms of the content I look forward to! Thanks sir!

[@changer8856]

Short and crisp explanation 🔥🔥

[@Sadlife0007]

✔ day 13 dhanwad sir

[@greeshavsharma1077]

Sir these sessions are really very helpful in last days of jee main. Thanks sir

[@ayushsrivastava156]

23:46 bhaiya D is not given in question how you took it as 250?

[@breathbadminton]

least distance of distinct vision = 25 cm = 250mm assume kr k kra h info k hisaab se

[@nanakguru8244]

mujhe bhi myopia hai sir, same pinch

[@raushanraj9948]

Sir I gain more confidence in conceptual topic so l salute to you for your dedication to understand the other

[@Yaara_1]

23:45 how will we get to know whether we have to use 1+D/f or only D/f? 🤔 Edit: Same hi answer aa rha hai, toh farak nhi padhta

[@balkrishna..shukla]

Mohit sir hai to sab kuchh mumkin hai Mohit sir is a fire......🔥🔥🔥

[@hardikjain-brb]

Sir in hcv formula for resolving power of microscope is given as lambda/2musin theta And in ncert it is different

[@mohitgoenka99]

follow what is written here

[@SATYAMKUMAR-dt4nx]

Thanks 👍👍👍🙏🙏🙏 so much sir for this wonderful session I understood this concept of optical instruments really very well thanks a lotttttttttttt you made this concept crystal clear sirrrrrrrrrrrrr.....best teacher of world ❤❤❤❤❤❤❤❤❤❤❤❤

[@atharvar6010]

Sir at 23:42 in that problem D was given or not?? And in that problem why did u use that formula we can also use m=L.D/fò.fè ? Any reason?

[@mohitgoenka99]

question should have clearly mentioned the case. but anyways with either formulae your ans will be close to 22 mm

[@atharvar6010]

@@mohitgoenka99 okay sir got it..

[@gudiyajain137]

Also for first time I am able to understand limit of resolution but Sir what is lamda in limit of resolution 19:30 Also in question 4) THEY NOT MENTIONED WHERE THE IMAGE FORMED WHAT SHOULD WE DO Please 🙏 answer sir

[@lakhangarg1998]

Bhut achi and short video hoti hai sir aapki very helpful ❣️❣️❣️❣️🙏🏼🙏🏼

[@realanshrajput]

Sir itna acha kaise pdha lete ho ❤❤😂 #learnlikeneverbefore

[@thecuriouskid5828]

Sir if it is not mentioned in the question, for eg- 23:40 , then which case should we consider? Image at infinity or at D? ( Even though in this question the options are far apart so both formula will give more or less same ans... but in general I wanted to know)

[@mohitgoenka99]

there is no such assumption. and as you said in this question both condition would have given similar result. Still question should be clear on such things. But still if nothing is given take image at D.

[@thecuriouskid5828]

@@mohitgoenka99 ok sir noted!

[@nitishdubey7757]

Bhagwat kai rup mai aap ho mere liye please sir ek baar mai aap sai baat karna chata hu you are my inspiration love all thing love you sir 1000000 million times because of you my physics is in pro level

[@nitishdubey7757]

Sir aap sai baat karna hai can you give me what's app no

[@nitishdubey7757]

Please reply sir

[@archikakaran7853]

Best video ... I found it so easy after watching this ... 🙏🙏

[@mohitgoenka99]

Glad to hear that

[@DefinitelyPrateek]

5:28 Revise Eye Defects

[@Abhishek_singh004_]

Content vs time ratio is too good... 🙋‍♂️

[@adarshdubey3414]

Aapka content hi unique h sir 🥰🥰🥰

[@ayushmishra1584]

23:47 sir 4th no ques D ka value kaise aaya please Anyone 🙏🏻

[@bhaveshchhimwal436]

25 cm =25×10=250mm if u have confusion that d ka value 25 hi kyu kyuki least distance of distinct vision 25 hota haia ur jb kuch mention na kia ho d lete hai

[@yashgarge9472]

Bhaiya refracting telescope ka dar khatam hogya apki wajah se sukhriye😍

[@IITiann]

sayad aagar sir aap nahi hote to mera kya hota sayad mai abhi roo raha hota. apna wakt barbaad kar raha hota 2 - 3 hrs ki video dhekne mai aapko bhagvan ne mere liye bheja hai sayad . aapne revision mai meri bhout bhout bhout help kiya hai aap aur kaamyabi ko hasil karen 🙇‍♂️🙇‍♂️

[@adityaarya6587]

Thanks bhaiya bilkul bhul gya tha yeah topic leken àache se revision ho gya 💕💕

[@arnavverma2461]

sir , one thing i want to point out , at 9:42 , you said tube length is dist bw objective and eye piece,,, but in ncert it says tube length of compound microscope is dist between second focus of objective and first focus of eyepiece,, plz reply sir i request you

[@Abhi_4676]

really helpful sESSION

[@ambargupta1600]

Eduniti=Always op 🔥

[@vijaysathvik7858]

Sir , why did you use 1+D/fe why not D/fe? In 4th question

[@RajeshYadav-me8cc]

because f

[@happiness2477]

Sir in compound microscope Jaha pe fo,fe

[@blaze102]

What if in question it is not given that we have to take normal adjustment or image at D Then we have to apply which formula

[@bhaveshchhimwal436]

D leke krna hota hai bhai agr kuch mention mahi hai to

[@arnavkalra8392]

Completed optical instrument sir thank you

[@samcurious]

Sir please bataiye ke damped oscillation par question kis shift main aya hua hai

[@samcurious]

Sir macroscopic and telescope ke formule main minus sign hona chahiye in magnification

[@mohitgoenka99]

We are simply finding the magnitude of magnification

[@vishwastech]

Thanks a lot guru ji love from Ghazipur ❤️❤️

[@ankitprasad6889]

Sir zener diode aur transister ke upar ek short vedio bana dijiye na ,woh topic acha se samjh nhi ata hai

[@pravinpatel6562]

Thanks sir ,maja aa gya aapka le ture dekhkr...... Sir ,please semiconductor ka lec ture daldo

[@nitubhuwalka9620]

Sir at 23:48 how do we get to know if we have to use this formula or LD/(Fo*Fe) which we use for infinity

[@ritvikgoyal2645]

i was finding this video for months thanks a lot !!!

[@jatinkala4758]

I have learned many new things

[@-xv5im]

Thanks again bhaiya 🙏🙏❣️❣️

[@mohitgoenka99]

welcome dear. make best use of these contents

[@jeeaspirants6932]

Best teacher & great mentor ✨ I you appreciate 🙌

[@gateocity]

Sabse phle toh bht bht dhanyvad aapko Bhaiya mechanics laiye please WPE toh hogya hai Most demanded videos

[@udaydixit4135]

thanlk u sir itna bada topic itne easily and itne kam time hogya thanku sir very very much thanku sir

[@mohitgoenka99]

most welcome dear

[@Rakshyyaa]

Sir, in Q.4 how did you get value of D

[@jeeaspirants6932]

Mohit goenka sir pure 💎 gem.

[@gyanadityaranveergautam4313]

thank very much sir very appreciable content and crystal clear explanation

[@dakshpuri9424]

sir boht dar lgra hai kabhi kabhi lgta h ki sb aata h or kbhi kbhi lgta h ki kch ni pdha \

[@nidhishsharma4764]

revising for both jee mains and cbse boards thanks mohit sir #STUDYLIKENEVERBEFORE #EDUNITI

[@mohitgoenka99]

great dear

[@nishtha283]

thanks bhaiya aapne pura optical instrument revise karwa diya and like pause karke note kiya and fir sawal kiye to i was able to solve them.

[@shipraporwal3856]

One of the topics that I used to struggle...thanku sir a lot

[@mohitgoenka99]

welcome dear

[@sohamghag3936]

Sir aap op ho sir thankyou

[@jagannathsahoo6018]

Yo yo❤ todu session sir❤... Demanding

[@Rudra-v2v]

Hello sir… resolving power to mahi hai na syllabus mein?

[@LakshyaMusicals]

Thank you so much sir 😅 very useful

[@anushkayadav8443]

Awesome lec sir ..these revision lecs really help us.

[@pujabharti5728]

Sir january ke pyq's bhi kara dijiye jaldi se plizz❤❤

[@vansh7311]

at23:39 sir how do we come to know that we have to take case of img formed atD or img formed at infinity

[@dolabanerjee6269]

Thanks a lot sir....this is to the point and wonderful session🥰🥰

[@mohitgoenka99]

Most welcome!

[@conceptisthekey5643]

All cleared.Earlier I used to struggle in memorizing formulas.You made this like a cake walk for me.Thank u sir