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Time taken by the sunlight to pass throu...

Time taken by the sunlight to pass through a slab of thickness 4 mm and refractive index 3 is ........ sec.

A

`4 xx 10^(-11)` s

B

`2 xx 10^(-11)` s

C

`2.5 xx 10^(10)` s

D

`36 xx 10^5` s

Text Solution

Verified by Experts

The correct Answer is:
A, D
`n=c/v=(c)/(d//t)=(ct)/(d)`
`therefore t= (nd)/(c)=(3xx4xx10^(-3))/(3xx10^8)=4xx10^(-11)` s
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