|This is an excellent and economical set for introductory ray
optics. The laser ray box projects one, three, or five parallel
bright beams, and is equipped with a momentary switch for safety.
A vinyl template with a degree circle and a linear scale forms
the optical disk, and the set includes seven clear acrylic optical
elements and a mirror with adjustable curvature for investigating
refraction, lenses, prisms and mirrors. The bottoms of the acrylic
elements are frosted to show the ray paths inside them.
Includes an activity guide and a storage box.