A 90 ° corner is made from a transparent optical material with a refractive index such that A cannot see B when he is standing behind the corner. Minimum value of refractive index is

Question

A 90 ° corner is made from a transparent optical material with a refractive index such that A cannot see B when he is standing behind the corner. Minimum value of refractive index is, 3, 2, 5, 7

MARKS App · Accepted Answer

r m i n > θ c r = 90 - β r is minimum when β is maximum. The maximum value of β is θ c ∴ 90 o - θ c > θ c 45 o > θ c ⇒ 1 2 > 1 μ ⇒ μ > 2

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