Light from a helium-neon laser l608 nm passes through a, Ask an Expert

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Light from a helium-neon laser (l=608 nm) passes through a circular aperture and is observed on a screen 2.15 m behind the aperture. The width of the central maximum is 2.24 cm. What is the diameter (in mm) of the hole? Have seen other answers on chegg; but don't understand solutions.

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