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What is the derivation of the obliquity factor (intensity proportional to 1+cosø,where ø is the angle between direction of wave propagation and wavefront tangent at some point on the envelop) used in the field of wave optics under Huygens principle?

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Here's a derivation from the most elementary principles, including an abstract and a conclusion: "Exact derivation of Kirchhoff's integral theorem and diffraction formula using high-school math".

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