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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
c = \(\sin^{-1} \frac{1}{n} = \sin^{-1} \frac{1}{1.8} = 34^o\)
Source: Myschool Past Questions Archive (Record #34081)