Concave Mirrors Worked Example | Ray Tracing 2 of 5 | Geometric Optics

Concave Mirrors Worked Example | Ray Tracing 2 of 5 | Geometric Optics | Doc Physics

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Doc Schuster

11 жыл бұрын

Wondering why I draw only a few rays? Check out this video: • Plane Mirrors | Geomet...

Пікірлер: 63

@ashtyngreenstein1155 8 жыл бұрын

"I don't want to talk about this anymore" made me laugh and taught me physics. you are why I have an A in college physics right now!!!

@kingsonza5740 6 жыл бұрын

Ashtyn Greenstein Yay

@rusca8 4 жыл бұрын

@cameronshapiro4620 4 жыл бұрын

The energy in this video is so chaotic

@sickpuppy7 10 жыл бұрын

Can't even begin to describe how awesome your videos are! They have been a monumental help in understanding this material and your enthusiasm for the subject is very motivating! Thank you so much!

@DocSchuster 10 жыл бұрын

Happy to help, Jacob! Thanks for letting me know.

@MrNashey1 8 жыл бұрын

Extremely helpful. Good revision for my physics exam on Monday :) I must say, he sounds like Benson from Regular Show :P

@Calltothepost 10 жыл бұрын

You are so much better than my actual professor. I think my grade would have been better if I had found your videos before the last 2 tests.

@DocSchuster 10 жыл бұрын

Thanks! I really liked teaching optics!

@SOCEMPIREcheathunter 9 жыл бұрын

This helped a lot! Thanks :) and also the other ray tracing examples on your other vids! ;) worth watching.

@DocSchuster 11 жыл бұрын

Please watch my earlier videos on geometric optics where I address these super questions!

@adityaprakash8393 6 жыл бұрын

not sure about line of action please explain thanks

@mrsminyoongi 6 жыл бұрын

your videos are very helpful and not boring AT ALL! thank you so much :)

@ralmslb 8 жыл бұрын

I don't even study physics or know what is this for but so freaking interesting :)

@SmeeUncleJoe 8 жыл бұрын

Entertaining and informative !!! Wish I had you for a prof/teacher. The only thing missing was the graph paper :>)

@geraldnlang 10 жыл бұрын

thank you. the sound effects just make this lesson perfect

@antoniaquesen 9 жыл бұрын

Made me laugh and was very informative thanks for making this

@B3bita1215 8 жыл бұрын

Hahaha!! the M-ray is sosososo cool!! :) Thanks for the perfect explanation Doc.

@anudeep7927 9 жыл бұрын

i have become ur serious fan Mr.Doc Schuster

@lnaanwar1517 8 жыл бұрын

This guy is amazing.

@DocSchuster 11 жыл бұрын

My videos are organized into playlists by topic. I have also put a link to the video you want in the description of this video.

@rusca8 4 жыл бұрын

The second to last line of action missing made me laugh a lot 😂 it builds over time

@aloha2302 9 жыл бұрын

Just replace my professor already haha

@jerushaprasanna9663 7 жыл бұрын

you are an awesome teacher... :)

@xnoumenon 11 жыл бұрын

Thank you very much, this was extremely helpful. Could you help me to understand why there aren't any rays that come in at a weird angle but do not strike the principal axis, nor come in through the focal point or center point? If I shined a laser from a spot above the center point at a downward angle toward a spot slightly above the principle axis, what would happen?

@DocSchuster 11 жыл бұрын

De nada!

@ahrims221 7 жыл бұрын

you are a saint

@siwueofk 10 жыл бұрын

Can you please explain to me the purpose of drawing the straight line where the mirror is? I still don't get it. How can you draw the normal then if it's a straight line?

@Francis-gg4rn 6 жыл бұрын

I believe it's because for all this math to work, the rays coming from the object have to be really really close to the horizontal axis. But it would be a mess if you draw the rays coming from an object so small, so you kinda zoom in and thus the mirror seems like a straight line. (a circle is composed of an infinite number of straight lines)

@kingsonza5740 6 жыл бұрын

Great!

@jacobsanchez1587 7 жыл бұрын

Concave mirrors are how polaroid cameras work right? And is why the pictures is inverted right?

@shahabbahman193 7 жыл бұрын

you are amazing wow

@By.Design. 10 жыл бұрын

my tuition money should go to you!

@DocSchuster 10 жыл бұрын

That'll be fine! Send it over. In fact, I think I'd be thrilled to get just 1% of your tuition money. But the trouble with me is that I'll work for free, too. Dang.

@glenishdsilva3538 10 жыл бұрын

You should get paid way more than other teachers

@maym5914 5 жыл бұрын

Where do u know where to place c

@Nepthyes 7 жыл бұрын

your line of action tells us that lightrays go into the mirrior and pop out of it on a different place and do not reflect at the angle it came in?

@sandamaliewijetunga4894 11 жыл бұрын

physics is now phun! (bad pun) lol love the sound effects for the rays XD

@tormentedterror 9 жыл бұрын

I need Help.Isn't the new cartesian sign convention for spherical mirrors states that distance towards the side ,where incident ray falls on the mirror is negative?

@DocSchuster 9 жыл бұрын

animesh pathak Who has established this convention? Tell me more!!! I have a video about sign conventions, and I'd love to adjust it if a new standard has been developed.

@allenwalker8657 6 жыл бұрын

Its something like the distance in the direction of incident ray is taken positive and the distance taken in the opposite direction of incident ray is negative.Well thats pretty much it.For more you can search on google.

@samiha1865 9 жыл бұрын

Super helpful video, just one question. On the last example, why does the the f-ray go upwards?

@DocSchuster 9 жыл бұрын

Samiha Hossain Thanks! You want the video before this - First Ray Tracing Instruction.

@samiha1865 9 жыл бұрын

Doc Schuster Makes more sense after watching the previous video, Thanks!

@rvbCabooservb 10 жыл бұрын

How come at 13:50 the P ray doesnt hit the line of action?

@crabnix 6 жыл бұрын

Because the focus isn't at the exact centre of the centre of the curvature and the poll of the mirror

@user-ky3tc3tm4v 10 жыл бұрын

Your lesson is soooooooooo cool! However I don't understand what 'line of action' is;( N why do we need it,too

@DocSchuster 10 жыл бұрын

It's the line normal to the principal axis where the mirror or lens intercepts the axis. It is how we manifest our assumption that the mirror is not very curved or that the lens is thin. Try drawing a ray diagram with it and without it and see which works better.

@gouravyadav7988 6 жыл бұрын

Wo wo woooo

@victoriaguevara4503 9 жыл бұрын

Are you sure there is supposed to be a line of action I never learned it like that. I think that might be why your lines never cross.

@DocSchuster 9 жыл бұрын

Victoria Guevara That's an appropriate question. You'll see lines of action commonly with lenses, but it's just my convention for mirrors. You'll notice here www.physicsclassroom.com/class/refln/Lesson-3/Ray-Diagrams-Concave-Mirrors that they show the mirrors as flat, which achieves the same goal.

@michaelchojnacki425 8 жыл бұрын

For the example where you had the image reformed directly under the object, why do your values not make sense if you plug them into the lens equation? 1/f = 1/i + 1/o I'm assuming, since the object and image distance were both 13 cm, and since they were at the center, the center is also 13 cm. This means the focal point is at 7.5 cm. So 1/7.5 cm = 1/13 + 1/13. This does not come out to be equal .13 =/= .153

@DocSchuster 8 жыл бұрын

+Michael Chojnacki You're going to love this: 6.5 /= 7.5

@Zyan819 3 ай бұрын

I used your method with the line of action but my teacher said the incident rays are supposed to reflect once they hit the curve, not the line behind it. I did that and now the computed value using the mirror equation and the ray diagram don't match. :((

@DocSchuster 3 ай бұрын

Time to bring your teacher to youtube! Show him/her that obviously the rays reflect at the surface of the mirror, but that the thin-lens equation assumes an infinitely thin lens/mirror. Hence, line of action! And then maybe you should become a teacher.