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If a light ray incident normally on one of the faces of the prism of refractive index 2 and the emergent ray just gazes the second face of the prism, then the angle of deviation is 1) 0° 2) 30° 3) 45° 4) 60°

If a light ray incident normally on one of the faces of the prism of refractive index 2 and the emergent ray just gazes the second face of the prism, then the angle of deviation is
 
1) 0°
2) 30°
3) 45°
4) 60°

Grade:12th pass

1 Answers

Arun
25763 Points
2 years ago
Dear student
 
if we make diagram, we see that
 
if angle of deviation is x
then
 
sin (90 - x) = ½
 
90 – x = 30
 
x = 60 degree

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