Optics Question 974

Question: The refractive index of water is 4 / 3 and that of glass is 5/3. What will be the critical angle for the ray of light entering water from the glass

[RPMT 1996]

Options:

A) sin145

B) sin154

C) sin1

12

D) sin121

Show Answer

Answer:

Correct Answer: A

Solution:

wμg=1sinCμgμw=5/34/3=1sinC

sinC=45C=sin1(45)



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