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What is the time taken (in seconds ) to ...

What is the time taken (in seconds ) to cross a glass of thickness 4 mm and `mu= 3` by light

A

`4 xx 10^(-11)`

B

`2 xx 10^(-11)`

C

`16 xx 10^(-11)`

D

`8 xx 10^(-10)`

Text Solution

Verified by Experts

The correct Answer is:
A
`v_(g) = (c )/(n) = (3 xx 10^(8))/(3) = 10^(8)` m/s
Time = `("Distance")/("speed") = (4 xx 10^(-3))/(10^(8)) = 4 xx 10^(-11)` sec.
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