A ray of light travels from an optically denser medium towards rarer medium. The critical angle for the two media is 'C'. The maximum possible angle of deviation of the ray is :

Question

$\begin {array} {1 1} (1)\;\large\frac{\pi}{2}-C & \quad (2)\;\pi-2C \\ (3)\;2C & \quad (4)\;\large\frac{\pi}{2}+C \end {array}$