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A ray R(1) is incident on the plane surf...

A ray `R_(1)` is incident on the plane surface of the glass slab (kept in air) of refractive index `sqrt(2)` at angle of incident equal to the critical angle for this air glass system. The refracted ray `R_(2)` undergoes partial reflection & refraction at the other surface. The angle between the reflected ray `R_(3)` and the refracted ray `R_(4)` at that surface is :

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