Physics-
General
Easy
Question
A ray R1 is incident on the plane surface of the glass slab (kept in air) of refractive index 
at angle of incident equal to the critical angle for this air glass system. The refracted ray R2 undergoes partial reflection & refraction at the other surface. The angle between reflected ray R3 and the refracted ray R4 at that surface is :
- 45°
- 135°
- 105°
- 75°
The correct answer is: 105°
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