Solveeit Logo
Login

Question

Physics Question on Refraction of Light

Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is 32\frac{3}{2} is

A

2×10−4s 2 \times {10}^{-4} s

B

2×108s 2 \times {10}^{8} s

C

2×10−11s 2 \times {10}^{-11} s

D

2×1011s 2 \times {10}^{11} s

Answer

2×10−11s 2 \times {10}^{-11} s

Explanation

Solution

vg=cμ=3×1083=2×108m/sv_g = \frac{ c }{\mu } = \frac{3 \times {10}^8}{3} = 2 \times {10}^ 8 m / s t=xvg=4×10−32×108=2×10−11st = \frac{ x }{v_g} = \frac{ 4 \times {10} ^{-3}}{ 2 \times {10}^{8}} = 2\times {10}^{-11} s