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Time taken by sunlight to pass through a...

Time taken by sunlight to pass through a window of thickness `4 mm` whose refraactive index is `(3)/(2),` is

A

`2 xx 10^(-4)` s

B

`2 xx 10^(-8) s`

C

`2 xx 10^(-11)` s

D

`2 xx 10^(11) s`

Text Solution

Verified by Experts

The correct Answer is:
C
Velocity of light c = `3 xx 10^(8)` m/s
and `v_(g) `= velocity of light in glass
`because n = (c)/(v_(g)) therefore v_(g) = (c)/(n) = (3 xx 10^(8))/( 1.5) = 2 xx 10^(8)` m/s
`therefore` Time taken by the sunlight to travel in glass is given by `t = ("distance")/("speed") = ( 4 xx 10^(-3))/(2 xx 10^(8)) = 2 xx 10^(-11) s`
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