Consider an isotropic point light source "S" located at some height "h" directly above a point "M" on a horizontal plane. If point "P" is on the plane at a distance "r" from "M", prove that the source "S" produces maximum irradiance on the plane at "P" when "P=r/root2"

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Consider an isotropic point light source "S" located at some height "h" directly above a point "M" on a horizontal plane. If point "P" is on the plane at a distance "r" from "M", prove that the source "S" produces maximum irradiance on the plane at "P" when "P=r/root2"

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