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MHT CET 2021 (22 Sep, Shift 2) · Superposition, Coherence & Intensity

Superposition, Coherence & Intensity question from MHT CET 2021 (22 Sep, Shift 2)

Q82MHT CET 2021 · 22 SEP · SHIFT 2Medium

Superposition, Coherence & Intensity

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

$\left[\cos 60^\circ = \sin 30^\circ = \frac{1}{2}\right]$

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Answer: (a)

$\Delta x = \lambda/3 \Rightarrow \phi = 2\pi/3$ .
$I = K\cos^2 60^\circ = \dfrac{K}{4}$
So the answer is (a) $\dfrac{K}{4}$ .

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