STANDARD Physics Interference MCQ Question
Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2 at point A and π at point B. Then the difference between the resultant intensities at A and B is
21
41
31
71
Correct Answer
Detailed Explanation
The intensity at a point is given by I = I₁ + I₂ + 2√(I₁I₂)cos φ. At point A, φ = π/2, so cos φ = 0, and at point B, φ = π, so cos φ = -1. Calculating the intensities and their difference gives 41.
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