| A | B |
| bioluminescence | light produced by living organisms |
| concave lens | a lens that curves inward |
| convex lens | a lens that curves outward |
| Law of Reflection | the angle of incoming light ray is equal to the ray traveling outward |
| light ray | a straight line beam of light |
| opaque | a material that completely blocks light |
| prism | a geometric clear glass or plastic shape that refracts light |
| refraction | the bending of light rays |
| translucent | lets only some light through |
| transparent | lets all light pass through |
| spectrum | a band of colors produced when light is refracted |
| primary colors of light | red, blue, & green |
| primary colors of pigment | magenta, cyan, & yellow |