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If the refractive index of a medium in air is 2.0, what is the critical...

Physics
JAMB 1992
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
  • A. 30o
  • B. 42o
  • C. 45o
  • D. 50o
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Correct Answer: Option A
Explanation
sin c = \(\frac{1}{n}\) = \(\frac{1}{2}\)

c = sin-1\((\frac{1}{n})\)

= 30o
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