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. Includes a substantial vinyl template with a degree circle and a linear scale forming the optical disk; 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. 
Includes manual and sturdy black plastic storage box.