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Question

What is the angle of incidence for an equilateral prism of refractive index 3 so that the ray is parallel to the base inside the prism?
  1. Either 30 or 60
  2. 30
  3. 60
  4. 45

A
45
B
60
C
Either 30 or 60
D
30
Solution
Verified by Toppr

From geometry, r=9060=30
Using Snell's Law,
sini=μsinr=3sin30=32
i=60

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