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History of Snell's Law

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Question

Light of wavelength λ in vacuum enters a medium of refractive index μ. Two points in this medium, lying along the path of this light, are at a distance apart. The phase difference between these points is

A

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B

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C

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D

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Solution

The correct option is B

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Q. Light of wavelength

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Q. Two light waves having the same wavelength

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