Question: A diaphragm with round aperture, whose radius r can be varied during the experiment, is placed between a point source of light and a screen.

A diaphragm with round aperture, whose radius r can be varied during the experiment, is placed between a point source of light and a screen. The distances from the diaphragm to the source and the screen are equal to a = 100cm and b = 125 cm. Determine the wavelength of light if the intensity maximum at the centre of the diffraction pattern of the screen is observed at r1 = 1.00 mm and the next maximum at r2 = 1.29 mm.

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