A linear aperture whose width is \( 0.02 \mathrm{~cm} \) is placed \( \mathrm{P} \) immediately ...

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A linear aperture whose width is \( 0.02 \mathrm{~cm} \) is placed
\( \mathrm{P} \) immediately in front of a lens of focal length \( 60 \mathrm{~cm} \).

W The aperture is illuminated normally by a parallel beam of wavelength \( 5 \times 10^{-5} \mathrm{~cm} \). The distance of the first dark band of the diffraction pattern from the centre of the screen is :-
(1) \( 0.20 \mathrm{~cm} \)
(2) \( 0.15 \mathrm{~cm} \)
(3) \( 0.10 \mathrm{~cm} \)
(4) \( 0.25 \mathrm{~cm} \)
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