A ray of light in air is incident at angle of incident `30^(@)` on one surface of slab in which
Channel: Doubtnut
Date: 2020-04-12

A ray of light in air is incident at angle of incident `30^(@)` on one surface of slab in which refractive index varies with y-axis. Light travels along the curve `y=4x^(2)` in the slab. If refractive index of the slab at `y=(1)/(2)m` in the slab is `(alpha)/(2)` find `alpha`.