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Light travels through a glass plate of thickness t and a refractive index μ. If c is the speed of light in vacuum, the time taken by light to travel this thickness of glass is

1. μt/c
2. t/μc
3. t/c
4. μt

Correct answer: μt/c

Solution

The speed of light in a medium is given by v = c/μ. The time taken to travel a distance t in the medium is t/v, which simplifies to μt/c.

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