| A | B |
|---|
| image | a picture of an object when light rays from the object are focused on a surface, as by a lens or mirror. |
| reflect | bouncing of a wave or ray off a surface, changes its direction |
| refraction | the bending of rays when they change speed when passing from one material to another at an angle. |
| opague | the characteristic of a material that does not allow light to pass through. |
| transparent | the characteristic of a material that allows light to pass through so that objects on the other side can be seen clearly. |
| transluscent | the characteristic of a material that allows some light to pass through, but that doesn't allow objects on the other to be seen clearly. |
| concave | a lens that is thinner in the middle, than it is on the odges and curves inward. |
| convex | a lens that is thicker in the middle than it is at the edges, and curves outward. |
| bioluminescence | giving off of light by a living organism, such as fireflies. |
| prism | an object of transparent material with three straight faces at an angle to each other which reflects visible light into a spectrum. |
| spectrum | a band of colors which white light is separated according to wave length, by being passed through a prism or other material. |
| visible light | the only part of the electromagnetic spectrum seen by the human eye. |
| pigments | colored material that absorbs certain colors of light and reflects other colors. |
| electomagnetic | its made up of electrical and magnetic energy |
| cochlea | the tube of the inner ear. Shaped somewhat like a snail shell containing the sensory ends of the auditory nerve. |
| pupil | the opening in the center of the iris; through which light centers the eye. |
| retina | the inner membrance at the back of the eyeball. made up of several layers of cells that are sensitive to light and transmit the images entering the eye to the optic nerve. |
| auditory nerve | the nerve that carries impulses from the inner ear to the brain so the brain receives the message that some sound reached the ears. |
| lens | a piece of glass or other transparent material. |
