Many experiments in optics can be performed using the rive ray box source which produces intense light of parallel, divergent or convergent rays. During experiment a piece of white paper is placed in front of the ray box, on a flat surface. Student can trace the position of optics and rays on the paper. It consists of an adjustable metal light box with mounted transformer. One, three or five thin rays or wide beam may be produced by an adjustable screen. Complete with a three wire cord. Operatable on 110V AC, 60 cycle.