A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the principal maximum in the resulting diffraction pattern varies with the width of the slit?

Question

A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the principal maximum in the resulting diffraction pattern varies with the width of the slit?, Principal maximum increases on increasing the width of slit, Principal maximum decreases on decreasing the width of slit, Principal maximum increases on decreasing the width of slit, None of these

MARKS App · Accepted Answer

Angular width of central maxima = 2 λ b ∴ The angular width of the principal maximum increases on decreasing the width of slit (b).

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