A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of 40o with the normal. Calculate the angle of refraction in the glass. [Refractive index of water = 1.33, Refractive index of glass = 1.5]

A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of 40o40 with the normal. Calculate the angle of refraction in the glass.

[Refractive index of water = 1.33, Refractive index of glass = 1.5]
A. 29.36o
B. 25.37o
C. 37.21o
D. 34.75o

Correct Option: Answer is D
n1=1.33; n2=1.5; i=40°; r= ?

from snells law:

n1 x sini=n2x sinr

⇒1.33 x sin40°=1.5 x sinr

⇒sinr=0.5700

⇒r = sin−1 (0.5700)

⇒ r= 34.75

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