Question: A horizontal hole 2.00 mm by 1.00 mm in an opaque screen is illuminated normally by a beam of collimated light of wavelength 500 nm.

A horizontal hole 2.00 mm by 1.00 mm in an opaque screen is illuminated normally by a beam of collimated light of wavelength 500 nm. If the incident irradiance is 30.0 W/m², calculate the approximate irradiance at a point 5.0 m from the hole on the central axis.

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