Question: Light from a helium-neon laser ( = 633 nm) passes through a circular aperture and is observed on a screen 4.0 m behind the aperture.

Light from a helium-neon laser (λ = 633 nm) passes through a circular aperture and is observed on a screen 4.0 m behind the aperture. The width of the central maximum is 2.5 cm. What is the diameter (in mm) of the hole?

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