A 90 0 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 -
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
r min > θ c
r = 90 0 – β
r is minimum when β is maximum.
Maximum value of β is θ c
∴ 90 0 – θ c > θ c
45 0 > θ c ⇒ 
> 
⇒ μ > 
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