NEET2026Physics-Wave Optics
NEET 2026 Physics Young's Double Slit Experiment MCQ Question
Type: MCQ-conceptual-Medium-Class 12
In Young's double slit experiment, using monochromatic light of wavelength λ, the intensity of light at a point on the screen where the path difference is λ, is K units. The intensity of light at a point where the path difference is λ/3 will be
A
K/4
B
K
C
2K
D
K/2
Correct Answer
Option A
Detailed Explanation
The intensity I is given by I = I₀ cos²(Δϕ/2). For a path difference of λ, I = K = I₀. For a path difference of λ/3, I = I₀ cos²(π/3) = I₀/4. Thus, the intensity is K/4.
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