Rays of light fall on a glass plate, the...

Rays of light fall on a glass plate, the refractive index of which is n. If the angle between the reflected and refracted rays is `90^@`, then the angle of incidence is

`sin^-1 (n)`

`cos^-1 (n)`

`tan^-1 (n)`

`tan^-1 (1//n)`

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