A: The optical electromagnetic region comprises light with wavelengths between 4,000 Å and 7,000 Å roughly. The human eye can separate the optical light beams in three blocks, or filters: blue (4,000-5,300 Å), green (4,500-6,500 Å) and red (5,000-7,500 Å). The modern astronomical CCDs detect light between 3,500 Å and 10,000 Å, but they are not capable of measuring the wavelength of each beam olflight. J-PAS has a camera and a filter system that will allow to decompose the the light of that wavelength range in 56 small blocks. This will provide J-PAS with exceptional capabilities in order to explore the spectra of astronomical objects. See the Survey Section for a more detailed description of the filter system.