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The surfaces of most atmosphereless solar system objects are referred to as regolith, layers of looselyconnected fragmentary debris, produced by meteorite impacts. Measurements of light scattered fromsuch surfaces provides information about the composition and structure of the surface. A suitable wayto characterize the scattering properties is to consider how the intensity and polarization of scatteredlight depends on the particle size, composition, porosity, roughness, wavelength of incident light andthe geometry of observation. In the present work, the e ect of porosity on bidirectional reectance asa function of phase angle is studied for alumina powder with grain size of 0.3 m and olivine powderwith grain size of 49 m at 543.5 nm. The optical constants of the alumina sample for each porositywere calculated with Maxwell Garnett e ective medium theory. On using each of the optical constants ofalumina sample in Mie theory with the Hapke model the variation of bidirectional reectance is obtainedas a function of phase angle with porosity as a parameter. Experimental reectance data are in goodagreement the model. For the olivine sample the e ect of porosity is studied using Hapke (2008).Key words: bidirectional reectance: EMT-porosity-regolith-scattering1. INTRODUCTIONThe study of light scattering by planetary regolith hasbeen and continues to a subject of great interest in manydi erent scienti c disciplines for many years. Labora-tory photometry of regolith-like samples is important forinterpreting the phase curves which are being used as aplanetary surface characterization tool. Consequently,laboratory based experiments on regolith analogues arebecoming more signi cant, so that in situ data can beanalyzed using laboratory results.2. INSTRUMENTAL DETAILSThe laboratory simulation was performed with the helpof a gonio-photometric device at the department ofPhysics, Assam University, Silchar, India. It consistsof two metal arms having a common horizontal axis ofrotation. The two arms can be rotated by 90

LABORATORY SIMULATION OF LIGHT SCATTERING FROM REGOLITH ANALOGUES: EFFECT OF POROSITY