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Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 μm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that

Asked in JEE Main 25th Feb 2nd Shift 2021 · Single slit diffraction

Answer: (1) its size decreases, and intensity increases

Step-by-step solution

Angular spread of the central disc θ ≈ (1.22λ)/a falls as a rises, so the pattern shrinks.

A larger hole admits more light, spread over a smaller area, so intensity increases.

Why the other options are wrong

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