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Question

The velocity of light in a piece of matter(air) is v. The thickness of the piece is t and its refractive index is μ. The distance traveled by light in air in time t/v is :

A
μt
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B
μt2
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C
μt3
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D
μt4
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Solution

The correct option is D μt
Velocity of light in any material is v=cμ
Therefore velocity of light in air c=μv
Therefore, distance traveled by it in time tv is:
μv×tv=μt

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