A ray of light travels from an opticaly denser to a rarer medium. The critical angle for the two media is c. the maximum possible deviation of the ray will be

Options

A. `2c`
B. `pi/2-c`
C. `pi-c`
D. `pi-2c`

Answer

B

Explanation

In the limiting case, `vec(AB)` will be the refracted ray which grazes along the surface AB corresponding to the incident ray OA. Therefore,here, angle of incidence=c (critical angle) and angle of refraction=`pi//2`
`therefore`Angle of deviation`=delta_(max)=(pi)/(2)-c`.