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Light travels through a glass plate of t...

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

A

`(ct)/(n)`

B

ntc

C

`(nt)/(c)`

D

`(t)/(nc)`

Text Solution

Verified by Experts

The correct Answer is:
C
The speed of light in glass `(v_(g)) = (c)/(n) ( because n = (c)/(v_(g)))`
`therefore` The time taken by light to travel a distance t in glass is
`T = ("Distance")/("Speed of light in glass") therefore T = (t)/(c//n) = (nt)/(c)`
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