Snell's laws proof using Huygen's principle | Wave optics | Physics | Khan Academy
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- เผยแพร่เมื่อ 3 พ.ย. 2020
- 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 Snell's law of refraction - Ratio of the sine of angle of incidence to the sine of the angle of refraction is a constant.
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Why is it so hard to imagine a wavefront
Believe me, some of these things are actually very bizarre. I've spent a significant amount of my life trying to understand what a wavefront is 😂😂
@@soumyadipbanerjee6744 right....
@@anishaghosh101 you should have a rural background to understand wavefronts
Particles in sync by vibrating at the same time with each other.... And the shape that appears if you look the thing from top veiw is basically the wave front.
It's pretty simple you just gotta see/imagine the waves carefully and you'll get the wavefront
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he has already done that on his website
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Super explanation
Light is not really slowing down if it enters an optical denser medium like water but it's the interiaction with the medium which is called group velocity is less than its normal velocity called the phase velocity.
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Victory for huygens
Using the same triangle if i calculate the cos i/cos r i get the constant , is that also right?
I saw a video on Fermilab which basically says that you can't use Huugen's princple to determine the correct path of light through the second medium because you can align the wave fronts in *several ways* in the second medium, only one of which agrees with experimentation.
To understand and derive Snell's law correctly, it looks to me like it is necessary to deduce this law from Maxwell's equations.
5:17 lmao xDD
How are time taken equal?
I have one question : when finding the distances, why is the time same for both??
because they are travelling at the same time, one is just further. We are taking a set time frame and saying that one travelled with a distance of v1t and other with v2t
First likes 👍
3:30
11:40
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DOES THE INTERFACE ACT AS A HUYGEN SOURCE OR IS IT THE INCIDENT WAVEFRONT WHICH ACTS A HUYGEN SOURCE...PLZ EXAPLAIN🙏🙏🙏
I believe it is the wavefront since the secondary waves originate on the wavefronts emitted by a luminous object.
Stop screaming 😱
at 10:58, if it has a slower velocity and speed, shouldn't it take a different time, thus the statement in the video false?
no the velocity maybe different, the the time is same.
when the endpoint of wavefront touches surface in time 't' then the wavelet produced from the first point will propagate in that time t.
@@the__saksham Ah, ok. Thank you for your response.
I came here after viewing the videos of reflection and huygens theory and it just keeps getting better!
😀👍
First View
13th like...
How time is cancelled
why will be the time be same in 11:08
Same question, one is incident ray other is refracted ray, how can they make both of them simultaneous 😅
First view
So hard
I wish light is not some kind of field
An eletromagnetic field that is waving but not like normal waves like waterwaves but waves that come in packets called photons.
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