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The absorption efficiency of cadmium compounds, prospective nanosolar cell materials, as spherical nanoparticles of radius less than 100 nm and effect of surrounding medium refractive index on them have been studied by Mie Plot. It is found that the absorption efficiency of CdSe, CdS, and CdTe increases with radius of the nanoparticle and also the UV-Visible absorption spectra shifts towards red. The maximum of absorption efficiency is observed at 80 nm radius and is in visible region for all the selected materials. Also with increase in surrounding refractive index, the absorption efficiency is found to be decreasing and absorption spectra is blue-shifted. For all these presently selected cadmium compounds, CdTe possess highest efficiency as compared to both CdS and CdSe. [ABSTRACT FROM AUTHOR]