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If the refractive index of a medium is \(\sqrt{2}\), what is the critical angle?

Physics
JAMB 1982

If the refractive index of a medium is \(\sqrt{2}\), what is the critical angle?

  • A. 45o
  • B. 50o12'
  • C. 56o25'
  • D. 75o
  • E. 90o
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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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