Question

The ratio of thickness of plates of two transparent mediums A and B is 6 : 4. If light takes equal time in passing through them, then refractive index of B with respect to A will be

• A. 1.4
• B. 1.5
• C. 1.75
• D. 1.33

Answer 1

The correct option is B 1.5

By using $t=\frac{\mu x}{c}$
$\Rightarrow \frac{{\mu }_B}{{\mu }_A}=\frac{x_A}{x_B}=\frac{6}{4}{\Rightarrow }_A{\mu }_B=\frac{3}{2}=1.5$