| A | B |
| opaque | material that does not allow light to pass through |
| transparent | material that allows light to pass through |
| translucent | letting some light through, appears blurry on the other side |
| polarization | allowing light vibrations to pass through in only one direction |
| refraction | the bending of light rays as they pass through objects |
| convex lens | a lens that is thicker in the middle than at the edges |
| concave lens | a mirror that curves in on the shiny side |
| spectrum | the band of light that is produce when a beam passes through a prism |
| primary colors | red green and blue |
| primary pigments | magenta, cyan, and yellow |
| electromagnetism | forces that come from electricity and magnetism combined |
| lasers | thin beams or streams of light |