A beam of light is incident from air to water at an angle of 30\(^o\). Find the angle of refraction if the refractive index of water is 4/3
A
15\(^o\)
B
18\(^o\)
C
22\(^o\)
D
24\(^o\)
Verified Correct Answer: C.
Physical Principles & Numerical Solution
X = \(\frac{4}{3}\) r = ?
Shell’s law:. = \(\frac{Sin i^0}{ Sin r^0}\)
= \(\frac{Sin 30^0}{Sin r^0}\)
Sin\(r^0\) = \(\frac{3 Sin 30^0}{4}\)
Sin \(r^0\) = 0.375
R \(^o\) = Sin-1 (0.375)
R \(^o\) = 22.02 \(^o\)
R \(^o\) = 22 \(^o\)
Source: Myschool Past Questions Archive (Record #47704)