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: Option D
Explanation
Sin C = (frac{1}{eta} = frac{1}{1.5} = 0.6667)
C = sin(^{-1}) 0.6667
= 42°
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