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A ray of light in air is incident at ang...


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`.

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