I had only ever seen this with lines on paper. Seeing this done with actual light is beautiful! Thank you so much! Also love the enthusiasm!

when im into the whole thing Doc: okay bye

I never really liked lenses until I started playing around with them more. I hope you have a chance to experiment, too!

you make me actually want to understand physics

I apologize for my oversight, and I thank you for your constructive criticism. I've always been sloppy on a couple of those typical mistakes. I envy the British, who seem so effortlessly to speak so flawlessly.

Very helpful! This was hard for me to visualize but now it makes sense. Thank you!

You can get lasers for just $5 at Walgreens these days. Diffraction gratings are cheap, but you'll have to order them from a science supply store: Diffraction Materials Card ($6) at Wards?

You were my favourite teacher in intermediate, you're my favourite teacher in medicine. I'll never forget you, Dr. Schuster! 💖

Very helpful for me who wants an actual example of the lessons! I also love the enthusiasm. Thank you very much for this!

Wow Sir, you are a genius!!! Thank you Sososooso much for the perfect explanation. I'm so happy to be able to finally understand this concept that I can literally jump up and down and scream "You rock Doc Schuster!!!"

Thank you so much for doing this. I wish I found out about this channel earlier. I will share this with everyone I know taking physics or prepping for an entrance exam like the MCAT, DAT, DOT...etc. Thank you for taking your valuable time to do this.

THE WORLD NEEDS MORE TEACHERS LIKE YOU

Great video! Doing some lens experiments right now and this was hugely helpful! It's been way too long since Physics 211 to remember much about lenses!

Thank you! I hope to visit the Philippines someday. I would call that light a "ray box" or something like that. It came in an old "blackboard optics" kit that our school has had for decades. Laser ray boxes are easy to find now - I use those in another optics video (lenses, I think). Keep up the hard work!

I love hos excited you are! Very interesting way to get us to actually care about those lenses. I actually have a favorite now! :D

I love you! I'm a visual person and you made it so simply. Thanks!

Great video on Convex glass. Thank you very much!

You actually discussed and gave all the important info of all the topics worth of 3 classes in my university.

Thank you for the help! Optics makes so much more sense with real examples.

Wow, after years and years of reading about this in textbooks I never quite understood it. But after seven minutes of video I feel like it's the easiest thing in the world. Thank you very much!

That was amazing! Thank you very much, sir

Whoaa..! Great VOICE Activeness And the way to tell!

u r very interesting ... if u give me the lec. in my university sure i will not only love physics but also i will love the university :-)

Hey Doc, this is a great video. Could you please tell me where can I buy this kit, that you are using to demonstrate all this physics ?

You bet! Thanks for the feedback.

This is great. Thanks Doc.

Thanks! I agree with your assessment of many demonstrations. One must present cliffhangers and teasers or the kids shut down. And there's so much beyond even what you and I understand, so how can we keep from being excited?!

Thank you very much this is so clear to understand

that s extremely fascinating! It acceptable for comprehension totally!

beautiful sir i undertand instantly

very cool! What kind of light source are you using or would you recommend to do this demonstration? Thanks!

I just bought them from a catalog, actually. They're made in India, they're really nice, and they're not pricey! Hooray, India!

i love his enthusiasm

Thank you soooooo much for your videos!! I've watched all of your optics videos now and I understand everything now for my test tomorrow!!! Your videos are amazing please keep making them!!

Thank you very much for uploading this video. I don't know what to do with my task if this video doesn't exist!

thank you for this video !! it is so much fun

this is so fun :) Boom! Thumbs up man!

wow thanks for the video sir. i always thought that optic is a boring subject to learn. but now i am more and more understand right now. thanks

"BOOOM!" lol

Amazing demonstration. I have always been curious about what my camera lens is doing.. how they can change the directions of light coming from any angle into parallel light that is projected onto an image sensor.

Thanks, its very intuitive demo

Pretty practical and cool...

MIND BLOWN! D:

great job, stay blessed

hey!!! question--- did you cut by laser your acrylics? or how did you made them??? thanks for the video!!

good job easy to learn ray optics

Sir I want to know what will be the thickness when line coming out from the lense..any formula to calculate

Thank you so much💙

that was intense:)

Thank you sir you save my life

Thank you!

It's wood (?) with silver on both sides. Not an ideal mirror, but great for demos.

わかりやすい👍

2:36 me 2:41 life

This is better than my teacher's explanation

What are you using for led source, how do get it collimated?

sir, what do you call the mirror that you used to demonstrate converging and diverging lens?

Sir can you please tell how do you get that beam of light for the experiment. I am interested in knowing the source of beam.

I would try a web search for blackboard optics kit. Our kit is VERY old.

Perfect.

Sorry, it's been many years. I have no idea. Some came in a "blackboard optics kit," so you could search for that or "acrylic optics blocks" or something. Best of luck.

One thing I could not able to understand on mirror lenses used in DLSRs. Will the mirror in the center of the lens is an obstacle?

what do you call the thing you used to give the beam of light?

Hi Doc! From Where I can get thise type of lens and mirors ?

Doc!! would you mind, if you have it available, the data for buying those things? the webpage perhaps??? Hooray optics!!!!

Thank you

I wish I did but I don't. I had the opportunity to play around with prisms in physics this year but I think I didn't appreciate them back them as much as I do now. I wish I could redo my first two semesters of physics now that I understand everything better. When am I ever gonna have the opportunity to work with lasers and diffraction gratings and all that cool stuff... It sucks that I didn't enjoy it while it was happening.

Inverting the plano convex lense will be ?

thanks you help me with my test

sir, please shows how chromatic aberration occurs in lens ,how it is reduced by plano convex lens by experiment

Hello. I'm Cathy, a Physics teacher here in Philippines. I found your way of lecturing as funny yet informative! Because you really made me laugh with the words you are using. :) But I have a question, what do you call the source of light that you used upon making this demo? Thanks and more power!

Very good video. . . .that intro bit about someone emailing you was a bit odd though.

sir..cud u plz tellme which side of concave mirror is polished with silver??

Cool video, explains the matter better than the others I could find on KZfaq. But You only cover Plano-Convex/Plano-Concave Lens. Could You also cover the lenses convex and concave on both sides?

Very very Thank's !!

More optics from you

Thanks! Yeah. You know when you try to be funny and it just doesn't work? At all? I think I'll crop that out now. Thanks for the reminder.

Which LED is that?

Sir, please please please please please make a video on show how spherical aberration occurs in convex lens, how to reduce spherical aberration using plano convex lens by experiment.

WHERE CAN I BUY THOSE MIRRORS USED BY YOU SIR?

I have question. Why does a plane mirror reflects light and not reflect image. I mean we can obtain that reflected light beam on a paper, but we can't obtain a reflected image on a paper (from a plane mirror)?😕

I get about 4 for the index of refraction just off a rough estimate of the angles of incidence/refraction. I'll do it again later more accurately.

👌👌👌

wow, this explains how we see the world

What's the light source? What brand? You need numbers or otherwise it makes no sense

make on video on cylindrical lens

Extra time is one of those things I don't have. Best of luck on the problem, though.

What is mear??

And since we're talking about it, would it be too much to ask you for your help with this one particular problem that I have to solve. I am having troubles calculating the angle of incidence so maybe if you have some extra time i could send you a photo and the details of the problem and you can help me figure out with the equations. I don't want to bother you or anything

Just what precisely is a "ray of light"?

I was reading the comments to see if someone had calculated the index of refraction to compare, but I think no one did xD, anyway, I got about 1,53

SIR ,WHAT IS THIS QUANTUM JUMPING ? COULD YOU PLEASE EXPLAIN IN SHORT ?

yeah i’m fucked for my physics test

this dude really likes optic physics with his legitimate expression of enthusiasm lol.... i know for a fact it's all real... nerds like this type of shit.

Are you a teacher? The correct answer is yes. Please send this to all "teachers" in the world ever.

Quantum whatever, what, don't can't not even. fine byeeeeee

Very helpful for me who wants an actual example of the lessons! I also love the enthusiasm. Thank you very much for this!

good job easy to learn ray optics

good job easy to learn ray optics

good job easy to learn ray optics