First slide

Ray optics

Question

ACB is right-angled prism with other angles as 60° and 30°. Refractive index of the prism is 1.5. AB has thin layer of liquid on it as shown. Light falls normally on the face AC. For total internal reflections, maximum refractive index of the liquid is

Easy

A

1.4
B

1.3
C

1.2
D

1.6

Solution

$μ_{1} = μ_{g} S i n i_{C} = 1 \cdot 5 \times S i n 60^{0} \approx 1.3$

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