| A | B |
|---|
| reflection | when a wave hits an obstacle and bounces back |
| Law of reflection | the angle of incidence = angle of reflection |
| refraction | light bend when it moves from one medium to another. |
| mirror | a shiny, smooth surface that reflects light |
| lens | plastic or glass that refracts light |
| concave lens | converging lens |
| convex lens | diverging lens |
| concave mirror | diverging mirror |
| convex mirror | converging mirror |
| speed of light | 300,000 km/s |
| electromagntic spectrum | range of em waves organized by frequency |
| electromagnetic wave | produced by changing electric and magnetic fields |
| ROY G BIV | colors of visible light in order of increasing frequency |
| radio waves | long wave lenght and low frequency |
| microwaves | short radio waves used for cell phones |
| infrared waves | related to thermal energy, just below visible light |
| visible light waves | the EM wave we can see |
| ultraviolet rays | above violet light, more energy helps us make vitamin D |
| x rays | high energy waves use to see bones and teeth |
| gamma rays | shortest wavelenght and highest frequency EM wave |
| EM WAVES | no medium required |
| focal point | where light rays meet at one point |
