Question

The critical angle for light entering from medium X into medium Y is q. The speed of light in medium X is u. The speed of light in medium Y is

• A. u (1 – $\cos q$)
• B. $\frac{u}{\cos q}$
• C. u($\cos q$)
• D. $\frac{u}{\sin q}$

Answer 1

The correct option is D

$\frac{u}{\sin q}$

Let the speed of light in medium Y be v

$\sin q$ = $\frac{{\eta }_y}{{\eta }_x}$ = $\frac{u}{v}$

Therefore, v = $\frac{u}{sinq}$