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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 velocity of light in vaccum, the time taken by the light to travel this thickness of glass is

A

`(t)/((mu c))`

B

`tmuc`

C

`(mu t)/(c )`

D

`(tc)/(mu)`

Text Solution

Verified by Experts

The correct Answer is:
C
`mu=""_(alpha)mu_(m)=("Velocity of light in a")/("Velocity of light in m")=(V_(a))/(V_(m))`
`rArr" "v_(m)=(v_(a))/(mu)=(c)/(mu)`
Time for traversing a thickness
`t.=(t)/(v_(m))=(mut)/(c)" [Here, t = time]"`
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