Question Bank MCQ • 1 Mark Section 3: Electromagnetic Theory Poynting vector

QB_PH_076: Poynting vector

Question Statement

A light beam of intensity $I$ is incident normally on a perfectly reflecting surface. The radiation pressure exerted is:
(A) 2I / c
(B) I / c
(C) I / (2c)
(D) 4I / c
Correct Answer
A
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: For reflection, momentum change is doubled: $P = 2I/c$.
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