| Term | Definition |
|---|
| lens | a transparent optical device used to converge or diverge transmitted light and to form images |
| mirror | polished surface that forms images by reflecting light |
| convex | curving or bulging outward |
| concave | curving inward |
| convex lens | lens such that a beam of light passing through it is brought to a point or focus |
| concave lens | a lens such that a parallel beam of light passing through it is caused to diverge or spread out |
| converge | v. approach; tend to meet; come together. |
| diverge | move or draw apart |
| refraction | the change in direction of a propagating wave (light or sound) when passing from one medium to another |
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