KVPY SA Exam 2011 Question Paper

Question : 23 of 80

Marks: +1, -0

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 24

1.10
1.55
1.42
1.72

Validate

Solution:

i = 45º ≥ C
For minimum refractive index C = 45º
µsin 45º = 1
µ =

√2

= 1.42

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