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NEET 2026 · Superposition, Coherence & Intensity

Superposition, Coherence & Intensity question from NEET 2026

Q15NEET 2026Medium

Superposition, Coherence & Intensity

In Young's double slit experiment, using monochromatic light of wavelength $\lambda$ , the intensity of light at a point on the screen where the path difference is $\lambda$ , is $K$ units. The intensity of light at a point where the path difference is $\frac{\lambda}{3}$ will be

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Answer: (a)

Path difference $\lambda$ is a bright fringe, so $K = I_{max}$ .
For $\lambda/3$ : $\phi = 2\pi/3$ , $I = K\cos^2 60^\circ = \dfrac{K}{4}$ .
So the answer is (a) $\dfrac{K}{4}$ .

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