The critical angle for light ray going from medium-1 to medium-2 is $i_{c}$. What will be the speed of light in medium-2, if its value in medium-1 is u?

$\frac{u}{\cos i_c}$ $u\left(1-\cos i_c\right)$ $\frac{u}{\sin i_c}$ $\frac{u}{1-\sin i_c}$

$\frac{u}{\sin i_c}$

The correct answer is Option (3) → $\frac{u}{\sin i_c}$