A point source of monochromatic light with a wavelength L = 5·10-5 cm is located at a distance a = 6.75 m from a screen with a hole D = 4.5 mm. At a distance b = a from the screen there is a screen (Fig.). How will the illumination change at point B on the screen if the diameter of the hole is increased to D1 = 5.2 mm?

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