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If the refractive index of a medium is V2, what is the critical angle?

If the refractive index of a medium is V2, what is the critical angle?
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  • A 45o
  • B 50o12'
  • C 56o25'
  • D 75o
  • E 90o
Correct Answer: Option A
Explanation:
sin C = \(\frac{1}{n}\) ; sin C = \(\frac{1}{√2}\)
C = sin-1\(\frac{1}{√2}\)
= 45o

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