• Sheila Prasad

      Articles written in Pramana – Journal of Physics

    • Rayleigh-sommerfeld diffraction theory and Lambert’s law

      Arvind S Marathay Sheila Prasad

      More Details Abstract Fulltext PDF

      The Rayleigh-Sommerfeld diffraction theory is used to derive expressions for (1) the spectral irradiance on the surface of a hemisphere covering the aperture and (2) the spectral radiant intensity. For a uniform, noncoherent source-aperture, both calculations predict a cosθ angular variation, as is known to be the case of Lambertian sources. A cosine-fourth dependence of the spectral irradiance on a plane parallel to the aperture plane is also indicated.

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