Light passess through glass of refractive index 1.5 . What is the time required for light to travel ` 4 xx 10^(8)` m in glass ?

Options

A. 3s
B. 2s
C. 1s
D. `0.5s`

Answer

B

Explanation

`V_(g)=(3 xx 10^(8))/( 1.5)= 2 xx 10^(8) m//s `
`:. t=("distance")/("velocity")=(4 xx 10^(8))/(2 xx 10^(8))=2s `