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JEE Main 2005 (AIEEE) · Diffraction at a Single Slit

Diffraction at a Single Slit question from JEE Main 2005 (AIEEE)

Q86JEE Main 2005 · AIEEEMedium

Diffraction at a Single Slit

If $I_0$ is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled?

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Answer: (a)

Amplitude at the principal maximum $\propto$ slit width $a$ , so $I_0 \propto a^2$ .
Doubling $a$ : $I = 2^2 I_0$
So the answer is (a) $4I_0$ .

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