Lag1989 task №21.13

Lag1989 task №21.13

The diffraction pattern is observed at a distance of L = 4m from a point source of monochromatic light (λ = 500nm). In the middle between the screen and the light source, there is a diaphragm with a round opening. At what radius r of the hole will the center of the diffraction rings observed on the screen be the darkest?

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