A parallel beam of monochromatic light falls normally on a single narrow slit. The angular width of the central maximum in the resulting diffraction pattern (a) decreases with increase of slitwidth (b) may increase or decrease (c) decreases with decrease of slitwidth (d) increases with increase in slitwidth

Answer: (a). Angular width of central maximum = (2λ)/(a) ∝ 1/a. Increasing slit width makes it smaller. So the answer is (a) decreases with increase of slit width.

A parallel beam of monochromatic light falls normally on a single… | MHT CET 2022 (11 Aug, Shift 2)

Q53MHT CET 2022 · 11 AUG · SHIFT 2Easy

Diffraction at a Single Slit

A parallel beam of monochromatic light falls normally on a single narrow slit. The angular width of the central maximum in the resulting diffraction pattern

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Answer: (a)

Angular width of central maximum $= \dfrac{2\lambda}{a} \propto \dfrac{1}{a}$ .
Increasing slit width makes it smaller.
So the answer is (a) decreases with increase of slit width.

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Diffraction at a Single Slit question from MHT CET 2022 (11 Aug, Shift 2)

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