Product Number: SB52561
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Grades 7-12. Use with any kind of ray box that produces one or more narrow, parallel rays of light that spread out vertically to demonstrate the path of light through the optical elements on a white board or sheet of paper. Clear acrylic optical elements are 2-3/8 in. W x 1/2 in. H with a refractive index of approximately 1.49. Includes two acrylic lenses (one each of double convex and double concave) and three mirrors (one each of convex, concave, and plane) in a wood storage box.