What is the approximate radius of the central bright diffraction spot of light of wavelength...

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What is the approximate radius of the central bright diffraction spot of light of wavelength 0 5 m if focal length of the lens is 20cm and radius of aperture of the lens is 5cm 1 1 22 m 3 4 22 m 2 2 30 m 4 6 23 m

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