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Wave Optics
Question
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What will be the effect on the fringes, if Young's double-slit experiment set up is immersed in water?

Answer

If the young's double slit experiment set-up is immersed in water, then the fringes become narrower.

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Some More Questions From Wave Optics Chapter

Let us list some of the factors which could possibly influence the speed of wave propagation:
(i) nature of source.
(ii) direction of propagation. 
(iii) motion of source and/or observer.
(iv) wave length.
(v) intensity of the wave.
On which of these factors, if any, does
(a) the speed of light in vacuum,
(b) the speed of light in a medium (say, the glass or water) depend?