The minimum refractive index of a material, of a prism of apex angle 90º, for which light cannot be transmitted for any value of i:
A
B
1.5
C
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
C
to avoid transmission
A ≥ 2 i c so 90º ≥ 2 sin –1 (1/ μ ) ⇒ sin –1 (1/ μ ) ≥ 45º ⇒ 
.
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