For an isosceles prism of angle A and refractive index , i…

Maths JEE - Advanced Previous Year Paper JEE-Advanced-2017-Paper-1 Single Correct MCQ

Published on: August 14, 2026

For an isosceles prism of angle A and refractive index , it is found that the angle of minimum deviation = A. Which of the following options is/are correct?

At minimum deviation, the incident angle ii and the refracting angle n at the first refracting surface are related by r 1 = (i 1/2 ).

For this prism the refractive index |i and the angle of prism A are related as

For this prism, the emergent ray at the second surface will be tangential to the surface when the angle of incidence at the first surface is

For the angle of incidence i 1 = A, the ray inside the prism is parallel to the base of the prism.

Text Solution

Verified by Experts

The correct answer is:

CHECK THE SOLUTION.

(a, c, d)

The minimum deviation produced by a prism

m = 2i - A = A

i 1 = i 2 = A and r 1 = r 2 = A/2

r 1 = i 1 /2

Now using Snell's law

sin A = sin A/2

= 2 cos (A/2)

For this prism when the emergent ray at the second surface is tangential to the surface

i 2 = /2

so,

For minimum deviation through isosceles prism, the ray inside the prism is parallel to the base of the prism.

──────────────────────────────────────────────────────────────────────────────────────────

Previous Question Next Question

Prepare Smarter with CGP Edu

Get practice questions, solutions, and test series in one place.

Write a Review

Share your experience with this question and solution.

Commentary

Send your comment, doubt, correction, or feedback to admin.

Student Reviews

What students say about this solution

No reviews yet. Be the first to write a review.

Share this question

Text Solution

Prepare Smarter with CGP Edu

Write a Review

Commentary

Student Reviews

Similar Questions