waves, the way light is measured, vacuum, empty space, medium, different types of matter that light interacts with, transparent, all light passes through, translucent, some light passes through and scatters, opaque, no light passes through (absorbs or reflects all light), ROY G BIV, wavelengths (red, orange, yellow, green, blue, indigo, violet), reflection, light energy bounces back at an equal and opposite angle, refraction, light energy bends as it passes from one medium to another, lens, a curved, transparent object that bends the light, concave lens, a lens that is thinner in the middle, convex lens, a lens that is thicker in the middle

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