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Standard XII
Physics
Question

Light enters an isosceles right triangular prism at normal incidence through face AB and undergoes total internal reflection at face BC as shown below.
The minimum value of the refractive index of the prism is close to
632861_75e57e915c274519aa3a8f2fdf07f543.png
  1. 1.55
  2. 1.10
  3. 1.42
  4. 1.72

A
1.10
B
1.55
C
1.72
D
1.42
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Solution
Verified by Toppr

The reflection angle is 45 ,that is also critical angle
now μsinθ=1→μ=√2=1.42

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