A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be
A
B
C
1.5
D
2.0
Text Solution
Verified by ExpertsThe correct answer is:
A
From figure it is clear that TIR takes place at surface AC
and BC
i.e . 
Hence 
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