light - a type of energy that can be seen, travels in waves, and can move through empty space, reflection - the bouncing back of light waves off of a surface, refraction - the bending of light waves as athey travel from one surface to another, lens - a curved piece of glass that bends light rays, convex lens - a lens that is thicker in the center and thinner at the edges, a shape that bends light inward , concave lens - a lens that is thinner in the center and thicker at the edges, a shape that bends light outward,

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