Now students can study light rays without a ray box or diffusing surface. These lenses are made of a special plastic containing tiny particles that give a slightly milky appearance in ambient light. Light rays from a laser beam travelling through the lenses illuminate the particles and are partially scattered, so the paths of the rays can be seen as they travel through the lens. The radius of curvature of both the convex and concave lens is identical, so they can be used together.Specifications:Lens (W x L x H) Focus/AnglesDouble Convex 30 x 70 x 20mm 50mmSingle Convex 15 x 70 x 20mm 100mmDouble Concave 12 x 70 x 20mm 50mmTrapezoid 40 x 70 x 20mm 90°,60°,120°
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