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      https://www.ias.ac.in/article/fulltext/pram/014/02/0103-0111

    • Keywords

       

      Diffraction; non-coherence; radiometry; Lambert’s law

    • Abstract

       

      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.

    • Author Affiliations

       

      Arvind S Marathay1 Sheila Prasad1 2

      1. Optical Sciences Center, University of Arizona, Tucson, Arizona - 85721, USA
      2. Department of Electrical Engineering, Northeastern University, Boston, Mass. - 02114, USA
    • Dates

       
  • Pramana – Journal of Physics | News

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