Roy, Ashim KSharma, Subodh KGupta, Ranjan2012-08-012012-08-012011-10-09http://hdl.handle.net/11007/1939In arecentpaper,thefrequencyandsizedistributiondependenceofextinctionspectra for astronomicalsilicateandgraphitegrainswasanalyzedinthecontextofMRNtype interstellardustmodelsinthefarultravioletandultravioletregions.Thesegrains were takentobehomogeneousspheresfollowingapowerlawsizedistribution.Inthe present workweextendtheanalysisfurthertocoverthevisibleaswellastheinfrared part oftheelectromagneticspectrum.Theanalyticformulaspresentedherealongwith thosegivenintheearlierpaperwouldenableonetoevaluateextinctionforthesegrains withinawiderwavelengthrange1000–22,500 ˚A andanalyzetheobservational interstellarextinctiondatainfargreaterdetailsenInterstellar grainsExtinction spectrumSize distributiondependenceArticle