You searched for: “geometric concentration ratio
geometric concentration ratio (s) (noun), geometric concentration ratios (pl)
The ratio (elation in degree or number between two similar things) of a solar collector aperture area (amount of light admitted) to the absorber area or the surface on a solar collector that absorbs solar radiation: Jeff learned thatt a geometric concentration ratio was the ration or relation between a section of the photosensitive part of a solar cell and the complete area of that cell.