A slit of width 'a' is illuminated with a monochromatic light of wavelength λ from a distant source and the diffraction pattern is observed on a screen placed at a distance 'D' fro

Question

A slit of width 'a' is illuminated with a monochromatic light of wavelength λ from a distant source and the diffraction pattern is observed on a screen placed at a distance 'D' from the slit. To increase the width of the central maximum one should

TestHub · Accepted Answer

By the theory of diffraction at a single slit, the width of the central maximum is given by W = a 2 D λ ​ ⇒ W ∝ D W ∝ λ and W ∝ a 1 ​ ​ Therefore, to increase the width of the central maximum a should be decreased.

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