Geometric Optics

[@asdfcsa41fas]

My physics teacher made me watch this. Least depressing homework I've got during this quarantine, thanks!

[@yoprofmatt]

Alexandru Ionuț Țîncu, You're very welcome. Glad you're enjoying the videos. You might also like my new site: www.universityphysics.education Cheers, Dr. A

[@papaya8604]

ok Alex

[@alinadaria]

Alexandru Ionuț Țîncu hi Coșbuc

[@asdfcsa41fas]

Alina Miu Ovidiu Morar?

[@alinadaria]

@@asdfcsa41fas ofc

[@bora3035]

I'm from Turkey and physics teachers here are nothing compared to you. You saved my life and made me to like physics more. Because you talked about stories behind every incidents. And this just impressed me so much. I admire your work and thank you for effort.

[@jacksonpayne3477]

Most aren’t mate, all my physics teachers have been ass, but man this guy can teacher, he explains it so damn well

[@zds6185]

Considering your incorrect grammar (hinting at your capability to understand your lessons in English) and the fact that we have many great physicists, talk for yourself and your own school :(

[@pantsetoo]

Starting today, I am skipping my physics classes and study at home with your channel. Much more effective. Great teacher

[@turboleggy]

3rd year physicst. Never skip class if you can afford to.

[@jerven1128]

how did it go ??? :flushed:

[@pantsetoo]

Not so many skipped classes, but with help from this channel solid skills I have now

[@averagejoe404]

@@jerven1128 lol. probly

[@berhanumoges9696]

Your lecture is Clean and Clear as the Mirror. Thank you Professor !

[@SomethingAbtScience]

But his mirror was dirty, are you implying that this lecture sucked?

[@yutongyang-b2e]

@@SomethingAbtScience lol

[@lubime10]

Professor Anderson, you have been producing the most trusted videos on youtube about science !!!! none one came close to you, Sir !!!! Your quality and contents are Superior to all out there! Please continue you giving up your teaching talent to your exclusive audience! you are an artist of knowledge!!!! YOU are the best entertainer science on youtube!!!!

[@Somaiscariot]

I was looking for some alternate sources for my physics class, and I came across these videos. Dr Anderson, you were one of the best teachers I have ever had. I remember failing your class, and I felt so incredibly bad about it. It probably (hopefully not) happens a lot, and I'm sure it wasn't a big deal to you, but it was a big deal to me. I felt like I personally let you down, and had trouble looking you in the eye after that. You seemed very understanding, though. I took your class again, tried very hard, and finally passed! I want to say that it was your class, that after 14-16 years of schooling, that finally taught me the value of studying and homework. On a side note, I am a physics teacher in high school now, and your class and teaching style are definitely one of my biggest inspirations and influences. I probably spend far too much time on E&M, but it's now one of my favorite topics. Thank you for all of your dedication and hard work!

[@yoprofmatt]

Ryan, Great to hear from you! And thanks for the kind words. They have made my day. Send me an email so we can catch up. Some of your classmates are also HS teachers now. We should get everyone connected. Cheers, Dr. A

[@muhammadnayeemrifath8467]

I am a student of class XII. I really need teachers like you.. It's so helpful & Thank you so much!!

[@manxr1]

What do u do now?!

[@averagejoe404]

@@manxr1 Jobless, probly

[@tharukameshen]

I'm from sri lanka ,and You are better than our physics teacher , Thanks a lot Professor !

[@shahzadabid7919]

Mr.Anderson, you have my honour sire! As a student of grade 10th, i find your lectures extremely resourceful. I appreciate ur teachings!

[@Splendiferousofficial]

Yeah and student of class 10 A

[@Splendiferousofficial]

Hello shahzad ( Maarij ) I Am ABDUL MUIZ

[@Splendiferousofficial]

I was about to watch his video when your comment came to me

[@sruthiabraham6070]

As a new teacher, I brush up my knowledge too to teach my students, I cant tell you how clearly I am understanding what you are saying and I am so thankful for this

[@naveensingh5787]

can u explain few things to me related to light

[@ivanpedro9151]

I love physics (thinking of doing energy engeeniring), but optics is a part of physics ive always neglected... and watching this I feel like a monkey discovering how to use sticks as tools, its so mind blowing. I am truly blessed to live in a era where top quality information is freely avalable like this, thank you so much professor.

[@zainabrahman58]

I loved physics in middle school.....but the thrills of high school just made me neglect it...Now that I am gonna give my final exam of high school I am glad I found you......you just refreshed my passion for physics from good old days...hoping my exam will go well...

[@kaiesalmahmud6782]

Thank You for these videos. I like your style.

[@TGUlricksen]

Those 3 rules...just answered my life long quest to answer the one question that I could not find in any astronomy telescope making book. Thank you. How to determine the size of an object at the focal plane at a certain Focal length seemed to be an impossible mission to find until now. I am kinda frustrated it was that easy but that a me problem....again thank you.

[@bimdinaudakara717]

is it weird that I see this prof. as DOCTOR STRANGE? very informative video btw.

[@x0urce942]

Definitely the best video on this topic on youtube also the idea to use a Glass and a Mirror to write on my screen is super smart, everyone should do that

[@mysterygirl-dq4zj]

Your videos really help me when i can't sleep, also your explanation is very good!

[@NuwanthikaFernando]

This man is gonna save my life in my physics finals next week

[@edcammarata6430]

Matt, simply,THANKS ,I try to watch u every day,so glad your out there

[@nahomelion]

Yo I swear I never wanted so much from a lecture like this in my whole life. Thank you, Dr. A

[@linxingchen8067]

Fell in love with Physics. ♥🤭

[@ShrirangChandankhede]

already fallen

[@kalpanamishra8102]

After watching this all my doubts are cleared. Thanks sir for this nice lecture

[@mikerazzer6908]

I'm a physics student. I'm trying to solve a problem in my physics assignment. It's really helpful..

[@LearnInnovateAI]

Brother.... You are Awesome..... Love from India.......😎

[@lol-rw7yd]

Today I really understood the tree of text you are extra extraordinary keep it up love it👍👍👍👍👍👍👍

[@ElRinconDeGatos]

You must be an alien to be such a good professor

[@thenightdances21]

Dr. Anderson you are amazing!! I unwed food more & more than my entire week of this lecture!!! I wished you were my professor !!

[@angelcasdatuin7474]

thanks for this... i really learned the simple way

[@wandellpassah8086]

This type of down to earth explanation should be recommended to all science students especially when off line classes are not possible. It is credible and poor students need not spend money as they need to do to some money minting lecture Today we seldom have such beautiful lecture Thank you

[@yoprofmatt]

Glad you're finding them useful, and thanks for the nice comment. Cheers, Dr. A

[@michaelstone229]

Every University should hire you to do a full online physics 1 and 2 course. Best physics lectures Ive ever had.

[@lifeinoman4500]

Finally understood what sir wanted me to understand in class. Thanks a lot 😊

[@dreamer23495]

I want to know where I can access these questions and mcqs this video mentions, can someone please help?

Watching the first time a vid from you, yet quite enough to instantly sub. Keep this marvelous work up

[@ananyae.1597]

This is the best video ever. I was so confused on this topic because my textbook is just not understandable to the normal human haha! Thank you so so so so much Professor Anderson.

[@flowers2536]

19:22 how do u clean off a mirror when its foggy ? Ans: by using a cloth like that .

[@yoprofmatt]

Yep. Unless you're in an optics lab. The approaches there are much more gentle. Cheers, Dr. A

[@flowers2536]

@@yoprofmatt Loved this lecture Sir . I am thankful :) ❤

[@mohamedislem322]

I never expected to see Dr. Strange explaining physics to me.

[@yoprofmatt]

Well I am a Dr. And I'm a little Strange. So yeah, it fits. Cheers, Dr. A

[@salehsaid6047]

Wonderful Mr Anderson

[@vze1lat7]

Why did I just see this now? I love how you integrate the conceptual aspects and application! 👍👍👍 Plus 1 Professor!

[@yoprofmatt]

vze1lat7, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@Machine4977]

Your drawing is upside down. Goes through glass and reflects off the silver?

[@SaharaBibi-v5m]

Amazing!!!!!!!!!!!!!!!! It really helps thanks alot

[@Ram-lr6ud]

Are you writing backwards on that glass panel? Really, I must know. Or do you flip the video afterwards?

[@hallfamily2141]

For a second when he air quoted "When we went to the moon" I thought he was implying that we didn't and that he was a moon landing denier, but then I remembered that he is teaching physics so that is pretty unlikely

[@yoprofmatt]

Just trying to keep it light. Thanks for noticing. Cheers, Dr. A

[@nahomelion]

@@yoprofmatt "Just trying to keep it light." I like what you did there with "light"

[@dinidunisal4648]

thanks a lot....please continue sir..because we need teachers who teach clearly on this internet

[@yoprofmatt]

I will continue. Appreciate the comment. Cheers, Dr. A

[@Gabriel-lk2xj]

Muito bom titio! Parabéns!

[@rahulgiree4859]

Simply.. you made my career.. when I was struggling in grade 11..

[@Jallah-Tafari]

Wow! What type of screen and pen are you using?

[@munnikumari317]

Wow i just loved it.......support from INDIA..superb....👌👌👌

[@yoprofmatt]

Sakshi Suman, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@bora3035]

Great lecture with key points and it's easy to understand it.Thank you so much.

[@vishnusharma7402]

Glass substrate is to support the metal But I studied that glass surface is for protection of metal to not to oxidise

[@lilieslilies1060]

Hello Sir, I have a doubt here. In this video, the image formed through convex lens is virtual image and the image formed through concave lens is real image. However, when I watch other videos and sites, it is said that the image formed through convex lens is real image and the image formed through concave lens is virtual image. I'm a bit confused at that point. I have watched the video and your explanation is very clear and direct, Sir. If you have time, can you explain a bit further? Thank you so much!

[@BubuTts]

Hi ,As I know concave lenses can't form real image. and convex lenses form virtual image when object distance < f(focal length).[up right] when object distance == focal length it form real image at the infinity when object in between f and 2f it form real image beyond 2f I don't know is it clear but hope it helps.and tell me if I'm wrong.Imm a student too

[@BubuTts]

this lecture about mirrors not lenses may be that's the case

[@lilieslilies1060]

@@BubuTts Yes, it's clear now. Thank you for your explanation.

[@lilieslilies1060]

@@BubuTts Ahh I didn't watch the labels in the video carefully. Thanks again for pointing out that fact!

[@dinidunisal4648]

i am commenting twice just to pay respect sir..this is just awesome.!!!!!!

[@kenoliwijerathne8944]

@Dinidu nisal I agree !!!👍

[@yoprofmatt]

Thanks. Thanks. Cheers, Dr. A

[@سارةعبدالله-ر4ظ]

Thank you Sir I mentioned a lot of important ideas, but I wish I had mentioned how to calculate the angle of incidence and the prevailing wellness between the incident light ray and the surface of the mirror if the mirror is shifted clockwise or counterclockwise

[@anthonyeffah8161]

you are a great physics teacher. Please help my son to fully understand physics. He is in high school in Ghana.

[@v-y]

Have a test on this tomorrow and i just understood how you're supposed to draw the situations, you quite literally saved me from an all-nighter

[@intelligent5484]

you sound smart.

[@v-y]

@@intelligent5484 he did indeed get me a good grade that test, can't believe this is free actually

[@intelligent5484]

@@v-y yeah

[@rockinstudy2944]

Prof Matt is the best physics teacher on KZbin

[@dennis1790]

Why did you draw the center ray as just going downward from the object in 45:17 ? I would assume the ray should meet the lense somewhere.

[@HariPrasad-sm1fd]

It is because,we use concave mirror there and the part which is hitting there makes it goes down words

[@nahomelion]

If this guy does deserve my school tuition, I don't know who does

[@fizixx]

Beautifully done. 😎 Physics Girl....I am sub'd to her channel. She's great, and I've seen the video you're talking about.

[@yoprofmatt]

Yep, Dianna Cowern is awesome. Had lunch with her a few years back. Cheers, Dr. A

[@fizixx]

@@yoprofmatt She rocks....sounds like a great lunch companion. Sure wouldn't have any problem finding things to talk about.

[@dianaabisheva745]

21:15 actually, If we were to see you inverted we wouldn’t be able to comprehend the text, because you’d be writing inverted for us all. Your mirror inverts your image back (?), if that’s how it works. So, that’s why when you raise your left hand we see your left hand. When you raise your right hand, we also see your right hand. Or maybe, your editors edited your video to be inverted again, so the whole time (without any editing) you’re basically writing while the mirror is inverted to everyone else. When they edit the video, they invert it back. That’s how I do it sometimes, too…but if that’s not the case, I’d really like to know why the mirror should be inverted to us but it isn’t.

[@scientificmeow]

لك جزيل الشكر أخي الكريم ☪️💜

[@yoprofmatt]

Your'e very welcome. Have a great day. Cheers, Dr. A

[@scientificmeow]

@@yoprofmatt 💜💜

[@taksh_shrut]

Your writing method like a boss.

[@yoprofmatt]

Wow, thanks! Boss man out.

[@magalatrevor4759]

No need to spend money on tutors pliz continue with these vidz 😍😍😍😍 Awesome

[@mukeshbhaimakhijani8957]

nice Video sir loved it u have increased my love for physics

[@RajinderSharma-iu8id]

Why does image is formed on water surface as there is no metal surface present there? What is the mechanism behind that ??

[@yoprofmatt]

I assume your question is why does light reflect off of water even though it's not metal? Here's an answer for you: Light reflects from all interfaces, the only question is how much. Metal is the best because the electrons are basically free to move, so they respond to the electric field in the incoming light and re-radiate it. In water, it's the polarization of the water itself that leads to the reflection. This polarization is still due to charge, of course. There are still electrons and they can still move a bit in response to the incoming light, they just can't move as far or as efficiently. Hope that helps. Cheers, Dr. A

[@madelynweathers2275]

I feel like due to the curvature of the earth, in fact one could eventually see their shoes

[@vindyakaumadiedodampegama2064]

Actually I hate science Nw my favourite subject is science after watching this Cz u taught this lesson beautifully sir Well-done sir thank u for ur dedication From sri lanka An odinary level student Plz add more more science videos

[@fortbuilder164]

Shekina rushel im higher level and at senior level but same man. I used to hate science and i had a garbage science teacher and i always got low marks. New year, im now a senior, I decided to take the gamble to pick a science subject. I picked physics. Best decision ever. I love my new teacher hes so chill.

[@vindyakaumadiedodampegama2064]

@@fortbuilder164 thank you soo much for the advice

[@김찹쨜]

wow,,, thank you so much! it is amazing lecture

[@kokonodray9859]

But all parallel rays don't pass through the focus.... Only para axial rays(rays close to principal axis) pass through the focus

[@yoprofmatt]

Excellent, you're getting into spherical aberration. Nicely done. Yes, we are simplifying here. Cheers, Dr. A

[@sachince4446]

Niccc video sirrr ur the best professor of physics. I love physics

[@VyvienneEaux]

I think the corner cube causes any incoming ray to bounce two times rather than three

[@nairajunior218]

I understood very well You're a genious

[@dannggg]

What kind of mascara does Shawn use?

[@BowgFrowg]

Thank you for making this accessible for all.

[@sanatkalia5607]

I came in search of my doubts in geo.optics but now I want to know how do you write like this.

[@brahman8288]

Its inverted

[@1.4142]

mirror

[@kotapatilahari9427]

This is a learning glass

[@manasiphatak184]

That’s a question from my side too😅

[@csaracho2009]

@@brahman8288 that is why he appears to write with the left hand. Thanks.

[@venkatapranavreddyd916]

Very useful for me thanks a lot!!!!!!🤓🤓

[@nana3276]

thanks a lot! can someone explain to me we see ourselves on water? he said we see ourselves on mirror because of the metal layer. but what about water?

[@RebeccaOmobolanle]

Pls i don't understand something. U said if ray illuminates an object. It reflects but aw come the image from the glass will reflect and go back again

[@abigailsalzberg2197]

I have my physics final tomorrow and this is seriously helping me actually learn the physics. I'm just sad I didn't see this sooner because then I wouldn't have to cram like this haha. Thanks!

[@yoprofmatt]

Love finals week. I always learned so much the night before the exam. Cheers, Dr. A

[@aes53]

Great lecture, but one thing I was wondering was is there a proof that a parabola is superior to a sphere. I assume that if the optic is spherical the rays will diverge from passing though the focal point at some incidence angle but I'm not sure I see how that happens.

[@مهندعلي-ج6د]

شكرا لك ... شرح ممتاز

[@dancoursen3129]

I know this is off topic, but how the heck do you teach yourself to write backwards like that?

[@meryemmakhoud9373]

thank y so much , this is the best physics lecture ihad ever seen

[@mimalgr8108]

Pr Ayache made made me watch this for the catch-up exam 🥲

[@arti7604]

sir 5 6 months back i watched ur electrostatics video and i forget about this channel coz my old id had some problem in opening 4 days later i have my physics exam and i was very worried coz i have studied nothingYET then i entered a topic and i found ur channel literally suddeNly i was like oh lord mattanderson how i forgot him i was regreting very much its morning and i am watching ur videos i have not taken even bath yet TODAY IS INDEED THE BEST DAY OF MY LIFE I FOUND U AGAIN CHEERS

[@yoprofmatt]

Yay! Glad to not be forgotten forever. Hope the exam went well. Cheers, Dr. A

[@macho8555]

Because the glass is insulator ? , Doesn't reflect???..... Aaa, I see ,. Hmm , nice lecture 😊👍 thank you very much 💐💐

[@yvonnehamisi5132]

This is amazing because you helped me understand. Thanks!!!!

[@yoprofmatt]

Then my mission is complete. Thanks for the note. Cheers, Dr. A

[@nikita6034]

Really nice explaining :)

[@felixmassot1389]

how did you learn to write in the opposite direction so smoothly? or do you mirror your image?

[@yoprofmatt]

Felix Massot, Not writing backwards (I'm not that talented). The board is called Learning Glass. You can check it out at www.learning.glass Cheers, Dr. A

[@huutiainen9393]

such a great lecture! thanks!

[@aguekmalual2982]

GREAT IT EASY TO UNDERSTANDABLE

[@yoprofmatt]

Aguek, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@ibanix2]

I love these series, though I have to make a small comment about 3:30 or so.... "left the star millions of years ago". Well... the photon might have bounced around inside the sun for millions of years (more like 100k years), but it didn't leave the sun until about 8 minutes before you see it!

[@sameerathreya9253]

Wait. How do you write like this so easily???

[@qahtanal-zaidi4933]

What you see is the image of the glass+lecturer reflected in the mirror

[@asif-uz-zamankhan937]

Sameer Athreya they rolated the screen like mirror using software..

[@phuongan]

kzbin.info/www/bejne/i6PXfZehjbWFhLM

[@hasan7275]

20:40 he actually explains it because it's relevant to the topic and I find that hilarious

[@niveyoga3242]

The irony in this question.

[@user-qv3jo9sc4c]

I am watching this a night before my optics exam I hope it will be helpful

[@krishnapriyaarunanandh5716]

physics for me is like me in air when i heard your class i was too elated will want more and more from you i find the gravity of your explanation in atoms and molecules great job sir A YOUR'S GREATFULSTUDENT IN AIR KRISHNAPRIYA

[@yoprofmatt]

Thanks for the poetic comment. I appreciate it. Cheers, Dr. A

[@mokarrommolla5820]

Hey sir, Anderson. I have a question for you if Light travels horizontally (0 degree) to the center of the concave or convex mirrors how are they gonna behave? thanks

[@nihilisticboi3520]

The light ray reflects back overlapping the incident ray. The reason is that the light ray passed through the centre of curvature so it must reflect back in that same direction. Another (possible) reason is that when the light ray hits the centre of either concave or convex mirror, the hitting point is similar to that of a plane mirror, so it reflects back in the opposite direction.

[@kumarbanjara7229]

Should't the metal foil be below the glass?

[@skzzy376]

Nice video helped me a lot

[@yoprofmatt]

Sub2iterlect, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@skzzy376]

@@yoprofmatt I will continue 👍🏾

[@abubakarsadick5337]

very intuitive and clear understanding wow

[@yoprofmatt]

Thanks much. Cheers, Dr. A

[@prayag8744]

Brilliant lecture! please add more videos sir

[@fatiol6931]

Why we don't have like this great teacher in our school or university? 😩🤷‍♀️