Time taken by sunlight to penetrate 2 mm in a glass slab is of the order of (n=1.5)

Options

A. ` 10^(-16)` sec
B. `10^(-19) ` sec
C. `10^(-11)` sec
D. `10^(-7)` sec

Answer

C

Explanation

`V_(g)=( 3 xx 10^(8))/(1.5) = 2xx 10^(8) m//s `
`:. t=("Distance ")/("Velocity")=(2 xx 10^(-3))/(2 xx 10^(8))=10^(-11)` sec