STANDARD Physics Interference MCQ Question
In Young's double slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen with path difference λ is M units. The intensity of light at a point where path difference is λ/3, is
M/2
M/4
M/8
M/16
Correct Answer
Detailed Explanation
The resultant intensity at a point is given by I' = I₁ + I₂ + 2√(I₁I₂) cos(ϕ). For path difference λ, the phase difference is 2π, resulting in maximum intensity M. For path difference λ/3, the phase difference is 2π/3, leading to I' = M/4.
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