Question

Time taken to cross 4mm window glass of refractive index 1.5 will be?

Answer 1

hello friend...!!

according to the given question we should find thetime taken by the glass that has refractive index 1.5 = 3 / 2 .

we know that ,

μ = c / v 

given that μ = 3/2 , c = 3 x $10^{8}$ m / s .

therefore ,

3 / 2 = 3 x $10^{8}$ /  v 

⇒ v = 2 x $10^{8}$
 
we know speed v = distance / time taken 

according to the question distance is 2mm = 2 x $10^{-3}$ m 

therefore ,

t = 2 x $10^{-3}$ / 2 x $10^{8}$ 

therefore ,

t = $10^{-11}$ seconds .

----------------------------------------------------------

hope it helps..!!