A diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then (a) no change in diffraction pattern. (b) diffraction bands become narrow and crowded together. (c) diffraction bands become broader and farther apart. (d) bands disappear.

Answer: (b). Fringe width and angular width are proportional to λ. λblue < λred, so bands become narrower and closer. So the answer is (b).

A diffraction pattern is obtained using a beam of red light. If red… | MHT CET 2024 (2 May, Shift 2)

Q31MHT CET 2024 · 2 MAY · SHIFT 2Easy

Diffraction at a Single Slit

A diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then

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Answer: (b)

Fringe width and angular width are proportional to $\lambda$ .
$\lambda_{\text{blue}} < \lambda_{\text{red}}$ , so bands become narrower and closer.
So the answer is (b).

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