A ray of light incident on a slab of tra...

A ray of light incident on a slab of transparent material is partly reflected from the surface and partly refracted into the slab. The reflected and refracted rays are mutually perpendicular. The incident ray makes an angle `i` with the normal to the slab. the refreactive index of the slab is

`tan^(-1)(i)`

`cot^(-1)(i)`

`sin^(-1)(i)`

`cos^(-1)(i)`

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