The limiting angle of incidence for an optical ray that can be transmitted

The limiting angle of incidence for an optical ray that can be transmitted by an equilateral prism of refractive index μ=√7/3 is given by(angles can be assumed to be small, so that sine of the angle is angle itself)

Options

(a) π/3
(b) π/6
(c) 2π/3
(d) π/2

Correct Answer:

π/6

Explanation:

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