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The included rechargeable Light Source has four colored LEDs on a 2-cm square, making it easy to observe image inversion and magnification. The RGB center LED makes it a breeze to show color mixing. This Optics set comes complete with a 1.4 m precision rail, 50 mm lens mounts, 50 mm concave and convex lenses, mirrors, a refraction cell, diffraction gratings, and more.