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NEETPhysicshard
Why does a soap bubble or a film of oil on water show swirling rainbow colours?
Light reflects off both the top and bottom surfaces of the thin film.
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NEETPhysicshard
In Young's double-slit experiment, what happens to the fringes if I move the slits closer together?
Fringe width is β = λD/d, so it's inversely proportional to the slit separation d.
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NEETPhysicshard
If I do the double-slit experiment underwater, do the fringes change?
Yes.
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NEETPhysicshard
Why does light passing through a single very narrow slit spread into a broad bright band instead of a sharp line?
That's single-slit diffraction: every point of the slit acts as a wavelet source, and these wavelets interfere.
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NEETPhysicshard
How do Polaroid sunglasses cut the glare off water and roads?
Light reflected off horizontal surfaces (water, wet roads, car bonnets) is mostly polarised horizontally.
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NEETPhysicshard
Why can't the headlights of two different cars ever produce an interference pattern?
Interference needs coherent sources — a constant phase relationship.
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