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MHT CET 2020 (16 Oct, Shift 2) · Diffraction at a Single Slit

Diffraction at a Single Slit question from MHT CET 2020 (16 Oct, Shift 2)

Q64MHT CET 2020 · 16 OCT · SHIFT 2Easy

Diffraction at a Single Slit

A light wave of wavelength $\lambda$ is incident on a slit of width $d$ . The resulting diffraction pattern is observed on a screen at a distance $D$ . If linear width of the principal maxima is equal to the width of the slit, then the distance $D$ is

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Answer: (b)

Linear width of principal maximum $= \dfrac{2D\lambda}{d}$ .
Equating to slit width: $\dfrac{2D\lambda}{d} = d \Rightarrow D = \dfrac{d^2}{2\lambda}$ .
So the answer is (b) $\dfrac{d^2}{2\lambda}$ .

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