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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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    $\begingroup$ Look at Kirchhoff's diffraction formula which contains parameters arbitrarily assigned in the Huygens equation. en.wikipedia.org/wiki/Kirchhoff%27s_diffraction_formula $\endgroup$ – Farcher Jul 16 '17 at 12:11
  • $\begingroup$ The mathematical derivation can be found in Godman "Intro to Fourier Optics". However, as stated here it turns out that this factor has no simple "quasi-physical" explanation. $\endgroup$ – Semoi Nov 24 at 22:17
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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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