Ray box., Raybox (12v)

Description

This Ray box has three openings, two of which can be used simultaneously by two sets of pupils. The two side openings each have two slots for accommodating blanking plates, 50 mm slide accessories. A front opening provides seven grooves for accessories and lenses which have been designed so that when used with a biconvex cylindrical lens of 75 mm focal length, divergent or convergent rays are obtained through the slit plate.