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A beam of light is incident from air to water at an angle...

A beam of light is incident from air to water at an angle of 30o. Find the angle of refraction if the refractive index of water is 4/3

A.

15o

B.

18o

C.

22o

D.

24o

Correct answer is C

X = 43 r = ?

  Shell’s law:.  = Sini0Sinr0

  = Sin300Sinr0

  Sinr0 = 3Sin3004

  Sin r0 = 0.375

  R o = Sin-1 (0.375)

  R o = 22.02 o

  R o = 22 o