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
Correct Answer: A. 30o
Explanation
sin c = \(\frac{1}{n}\) = \(\frac{1}{2}\)
c = sin-1\((\frac{1}{n})\)
= 30o
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