| A | B |
|---|
| beam | a group of closely related rays. May also be used to mean one ray |
| concave | hollowed or curved inward. The surface of a concave mirror or lens curves inward like the depression in a bowl |
| converge | to come together at a point |
| convex | bulging or curved outward. The surface of a convex mirror or lens bulges out like the outer surface of a ball |
| cornea | the transparent, rounded, outer surface of the eye that helps to focus light onto the retina |
| diverge | to spread apart |
| farsighted | able to see objects better from a distance than from close up |
| focus | to make an image clear. To cause rays to converge to a point, or to cause a lens or mirror to project an image |
| hypothesis | a prelininary explanation used as the basis for an experiment |
| image | the reproduction of an object formed by a lens or mirror |
