Reflection laws proof using Huygen's principle | Wave optics | Physics | Khan Academy

Huygen's principle states that every point on a wavefront behaves as a source for secondary waves, whose common tangent (envelop) becomes the new wavefront. Using this principle, let's prove the laws of reflection
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Created by Mahesh Shenoy

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this is the first time i had to step away from my always go to tutor channel bec for the first time I couldn't understand their explanation about Huygen's....then I found this. Oh my gosh with the animations and everything thank you so much !! it is so thoughtful and thorough!! I can't visualize it so this really is so clear.

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Thank you sir 😊for this video. It help me a lot to imagine the process which I can't able to imagine by only reading the books.

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I think physics is all about understanding the concepts, Thank you for making the concept crystal clear.

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Wow I'm not a science student and i got it. Brilliantly explained

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Seriously I understood each and every thing 😀😀thank you..

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Animation is amazing . Specially 0.47. It's just like a real feeling as if everything actually happening in front of me (3D) Thank you

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Victory for Huygen

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Q. Light assummed a ray is for ray optics but here in wave optics, we still have rays together wavefront...🤷

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What do you mean by Huygens source getting activated?dosent it always remains activated

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[@yoihensanark6114]

Can someone explain me how the angle between surface and the reflected wavefront = r

[@ΒασιληςΧουνταλος]

The sum of a triangle is equal to 180 degrees. We have a 90 degree and a (90-r) degree. For that reason the missing angle is equal to r because 90+(90-r)+M(missing angle)=180 => M=180-[90+(90-r)] => M=180-180+r => M=r. I hope that you find it helpful.

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[@vassmiklos]

from 0:32 to 0:52 the purple vector is not normal to incident ray's wavefront. So in the end, the angles of directions (purple and yellow) dont seem equal.

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This is enough for neet?

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Bismoi is brend Embesiter

[@davincibuddha]

At 8:30 can someone explain this if outside angle is r and one inside angle is 90-r and other inside angle is also r?

[@davincibuddha]

I got the answer thanks..

[@Dhyaneshwar-um6ln]

Why reflected and incident wavefront have same speed

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Because they're in the same medium.

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2:17 7:28

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Wait how does the mirror produce 2° waves???

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reflection

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But the angle between i&r is 90

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Creed

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I swear to god, this chapter is gonna be the death of me

[@fuzzywuzzy599]

Huygen says...

[@kavirufernando1732]

Can't you do it with one ray? Why can't you draw a wave front with one light ray?

[@sooyeah7367]

yes we can draw , becoz.. rays are perp to w.f but in this case we need to get the angles similar.. aand to make that simple we need to check for congruency.. hence 2 rays

[@sooyeah7367]

moreover for a plane wf. we need to take parallel rays so..

[@narenprakash6732]

There is nothing called one wave of light. Its always a wavefront according to huygens

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