Monochromatic plane waves perpendicularly illuminate a small circular hole in a screen. From point-P, beyond the hole
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Monochromatic plane waves perpendicularly illuminate a small circular hole in a screen. From point-P, beyond the hole on the central axis, exactly 3 Fresnel zones appear to fill the hole. If the incident irradiance on the aperture screen is Iu, prove that the irradiance at P is very nearly 4Iu. Because these are plane waves, the unobstructed irradiance at P would equal Iu.
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