Question

If i₁ and i₂ are the angle of incidence and angle of emergence respectively, then at the angle of minimum deviation

• A. \(i_1=i_2\)
• B. \(i_1=2i_2\)
• C. \(2i_1=i_2\)
• D. \(i_1=\sqrt{i_2}\)

Answer 1

The Correct Option is A

In a prism, the angle of deviation is minimum when the path of the light ray inside the prism is symmetric. This occurs when the angle of incidence \( i_1 \) is equal to the angle of emergence \( i_2 \). At minimum deviation: \[ i_1 = i_2 \] This condition ensures that the ray passes through the prism symmetrically and the total deviation is minimized.

The correct answer is option (A): \(i_1=i_2\)