Huygen's principle of secondary waves | Wave optics | Physics | Khan Academy

Huygen's principle states every point on the current wavefront acts as a source of secondary spherical waves. These secondary waves propagate outwards, in the forward direction, and a common tangent (an envelope) to all these waves constitute the new wavefront.
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Created by Mahesh Shenoy

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FInally understood the undeerlying concept behind Huygen's principle. Thanks for all the videos

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06:08
Actually here , the wave contribution is proportional to ½[cos(¤)+1] and for the backwards direction cos¤ would be 180
i.e -1 , ½[-1 + 1] = 0

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Thanks for explaining this but what app are you using for drawing those?

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so what happens if it enter again a finite hole .it's gona be again curved or straight or mix...................

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Well ..I wanted to try this but was too lazy to gather all the stuff .. .so I one day just partially closed my eyes, uk with my eyelashes right above my pupil and looked at a distant street light ( kind of replicating the small hole in the cardboard) ...I did actually see how the light rays kind of scatter ...if i look at that street light (which is actually a small bulb) with my eyes open its a different picture while its different with eyes almost closed

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7:30 why would the ripples suddenly begin at the slit? Shouldn't they have been rippling from the source?

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4:55 secondary wavelet
9:29

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Sir u have shown a 2d wavefronts But I am unable to imagine 3d wavefronts.please can u create 3d wavefronts

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What happens in the case of a laser light Or a laser beam ? Why doesn't it spread?

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At 0:51, why is light shown as longitudinal waves, while it’s a transverse wave?

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OMG WAVEFRONTS ASTOUND ME!!!!! 5:30 IS IMPECCABLE

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Can a common tangent be a curve?

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I dont get one thing, so when the plane wave came in from a source the edges didnt bend. But after going through slit, you included the round edge. But shouldnt that also apply to the wavefront before the slit since its also a finite wavefront?

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It doesn’t bent cuz it not a finite plane ,

[@charleszr853]

@@mumthas8870 but how is the wavefront that pass through the slit not a infinite wavefront? Its the exact same as the plane wave coming in but just shorter?

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Sir I did a project on FRACTALS........and THE CONCEPT OF SECONDARY WAVELETS FOLLOW that !! INFINITE AREA OF WAVEFRONTS!!!!!

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Wait huygens principle only applies to light right?

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3:10 If the light is moving at light speed, how can the secondary waves move faster? Shouldn't any secondary waves be behind a primary wave?!

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I have the same doubt!!

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I think that a secondary wave is just an interpretation of the primary wave after a given time, I mean it tells how the primary wave would look like in the other second or how it will travel.

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But ether does not exist???

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