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The refractive index of a medium relative to air is 1.8. Calculate to the nearest...

Physics
WAEC 2002
The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium
  • A. 68o
  • B. 56o
  • C. 34o
  • D. 18o
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Correct Answer: Option C
Explanation
c = \(\sin^{-1} \frac{1}{n} = \sin^{-1} \frac{1}{1.8} = 34^o\)
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