The refractive index of a material is 1.5. Calculate the critical angle at the glass-air
PHYSICS
WAEC 2013
The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface
- A. 19o
- B. 21o
- C. 39o
- D. 42o
Correct Answer: D. 42o
Explanation
Sin C = \(\frac{1}{\eta} = \frac{1}{1.5} = 0.6667\)
C = sin\(^{-1}\) 0.6667
= 42°
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