A ray of light travelling in air is inc...

A ray of light travelling in air is inciden at angle of inciden `30^@` on one surface of slab in which refractive index varies with y. The light travels along the curve `y =4x^(2)` ( y and x are in meter) in the slab. Find out the refractive index of the slab at `y=1//2m` in the slab.

1.5

1.7

`(sqrt3)/(2)`

`(2)/(sqrt3)`

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