First slide

Total internal reflection - Ray optics and optical instruments

Question

If critical angle for a material to air is 30°, the refractive index of the material will be

Easy

A

1.0
B

1.5
C

2.0
D

2.5

Solution

$μ = \frac{1}{sinC} = \frac{1}{\sin 30} = 2$

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