| A | B |
|---|
| lux | a unit of measure for the brightness of light |
| reflection | the bouncing back of a wave after it hits a barrier |
| diffuse reflection | the scattering of light waves after they hit an irregular barriar |
| refraction | the change in direction when a wave enters a different medium |
| convex lens | a lens that is thicker in the middle then it is at the edges; causes light rays to converge |
| concave lens | a lens that is thinner in the middle than it is at the edges; causes light rays to diverge |
| focal length | the distance from the lens to the focus |
| retina | a sensitive layer of nerve cells at the back of you eye |
| farsightedness | when the eyeballs are a little too short from front to back |
| nearsightedness | when the eyevalls are too long from front to back, images are formed in front of the retina |
| electromagnetic waves | transverse waves that carry both electric and magnetic energy (light waves) |
| electromagnetic spectrum | the arrangement of EM waves in order of wavelength and frequency |
| visible spectrum | Red, Orange, Yellow, Green, Blue |
| x-rays | high frequency EM waves, rays can penetrate thorugh skin, but not dense material like bones. |
| ultraviolet radiation | EM waves with a frequency just higher than visible light |
| infrared radiation | part of the EM spectrum were light waves are just below visible light |
| radio waves | EM waves with the lowest frequency, longets wavelengths |
| phosphor dots | dots on a TV screen, that re simulated, resulting in color. |
| radar | radio detection and ranging |
| microwaves | short wavelength radio wavbes used for cooking and communication |
| rods | light sensitive cells found in the retina of the eye, allow you to see in dim light |
| cones | cells in the retina that allow you to detect color and contorls the sharpness of an image |
| primary colors of light | Red, Green, and Blue |
| secondary colors of light | Cyan, Yellow, and Magenta |
| polarized light | light passed through a polarizing filter |
| Jan Vermeer | artist, accused of using the "camera obscura" to trace his paintings |
| Oleaus Roemer | calculated the speed of light by studying the eclipses of Jupiter's moons |
| 300,000 km/sec | speed of light in a vacuum |
| colorblindeness | the inability to distinguish colors, usually red and green |
