Question: The diffraction pattern of a small circular object has minima at the same angles as the diffraction pattern of a circular hole of the same

The diffraction pattern of a small circular object has minima at the same angles as the diffraction pattern of a circular hole of the same diameter. By shining a laser on a sample of human blood, one can observe the diffraction pattern from red blood cells, which are roughly circular, and deduce the diameter of the cells. Light of wavelength 532 nm is diffracted from a sample of blood; the pattern is viewed on a screen 46 cm from the sample, and the central maximum is 7.5 cm in diameter. What is the diameter of the red blood cells in the sample?

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