First slide

Total internal reflection - Ray optics and optical instruments

Question

The critical angle of a medium with respect to air is 45° . The refractive index of medium is

Moderate

A

1.41
B

1.2
C

1.5
D

2

Solution

$\sin 45^{\circ} = \frac{1}{μ} \Rightarrow μ = \sqrt{2} = 1 .41$

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