Light from a helium-neon laser 633nm passes during a
Light from a helium-neon laser (?=633nm) passes during a circular aperture and is observed on a screen 4.0m behind the aperture. The width of the central maximum is 2.5cm.
Determine what is the diameter (in mm) of the hole?
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light from a helium-neon laser 633nm passes during a circular aperture and is observed on a screen 40m behind the
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