What is the radius of the first diffraction minimum

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1. A solar eclipse is projected through a pin- hole of diameter 0.247mmand strikes a screen 3.12 m away. What is the diameter of the image? Both the Sun and Moon have angular diameters of very nearly 0.661?. Answer in units of cm.

2. What is the radius of the first diffraction minimum? (Assume that the wavelength is 540 nm.) Answer in units of mm.

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