Physics-
General
Easy
Question
A ray of light travelling in glass having refractive index 
, is incident at a critical angle C on the glass- air interface. If a thin layer of water is poured on glass air interface, then what will be the angle of emergence of this ray in air when it emerges from water-air interface?
- 180°
- 0°
- 90°
- 45°
The correct answer is: 90°
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