A plane light wave with wavelength \( \lambda=0.54 \mu \mathrm{m} \) goes through a thin converg...

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A plane light wave with wavelength \( \lambda=0.54 \mu \mathrm{m} \) goes through a thin converging lens with focal length \( f=50 \mathrm{~cm} \) and an aperture stop fixed immediately after the lens, and reaches a screen placed at a distance \( b=75 \mathrm{~cm} \) from the aperture stop. At what aperture radii has the centre of the diffraction pattern on the screen the maximum illuminance?
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