Includes everything you need to demonstrate basic principles of light and color. This valuable kit contains double convex lens (38 mm, glass), double concave lens (38 mm, glass), plain lens (38 mm, glass), clear glass screen, mirror (glass), white plastic screen, 4 cellophane squares (4 colors), 3 lens/mirror supports, equilateral prism (25 x 50 mm, acrylic), graduated plastic beaker, candle, and flashlight. Kit comes in a reusable storage case complete with instructions.