Question

If c is the velocity of light in free space, the time taken by light to travel a distance x in a medium refractive index mu is

Answer 1

Answer:

Refractive index of a medium μ = c / v. where c is velocity of light in air/vacuum and v is that of in medium.

Hence velocity of light in medium is v = c / μ. The distance 'x' travelling time in medium is then x / (c/μ) = (μx)/c.

Answer 2

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Hence velocity of light in medium is v = c / μ. The distance 'x' travelling time in medium is then x / (c/μ) = (μx)/c.