Question

An equilateral prism has angle of minimum deviation 30⁰. Find total deviation if a ray is incident normally on a surface.

• A. 120⁰
• B. 60⁰
• C. 90⁰
• D. None of these

Answer 1

Answer: (B)

60⁰

Answer 2

= $\sqrt { 2 }$ So q_cr = 45⁰

So TIR at second face