Physics Terms

3. Electronic conductors that allow electricity to flow in one direction by using semiconductors
4. The ability of the brain to extrapolate light rays back and subconsciously coordinate information from the left and right eye
7. Light produced as a result of high temperatures; ex) heating a metal coil until it glows
9. Let light pass through easily; you can see objects clearly that are behind them; ex) glass
10. When light rays collect and meet at a point; phenomenon that allows the brain to form an image at this point
12. Occurs when the incident light ray is reflected back into the first medium because it refracts more than 90o from the normal
13. The line that is perpendicular (90o) to the reflective surface; drawn where the incident light ray strikes the surface
16. Where objects absorb UV light and immediately re-emit it
17. The original incoming ray from a luminous source, or reflected off a non-luminous object; the first ray
20. Light caused by electric current flowing through a gas
21. Do not allow light to pass through; all incident light is either absorbed or reflected; ex) steel
23. Where objects are covered in phosphors that absorb UV light and re-emit it when the lights are off; glow in the dark
25. Communicates the density of a medium; derived from how much slower light moves within the medium as compared to a vacuum
26. Angle between the incident ray and the normal
27. Angle between the refracted ray and the normal

1. Light produced due to friction of crystals being scratched or rubbed together
2. The ray that bounces off an object or mirror; the second ray
5. Diverging mirror; curved mirror which aims outward and does not focus the light rays, but the diverging rays in front of the mirror are extrapolated back to create a virtual image behind the mirror
6. A system used to classify waves of light based on its wavelength.
8. An object that can only be seen by reflecting light
11. Angle at which the light ray will not refract out of the first medium, but will bend more than 90o from the normal and remain within the first medium; all angles of incidence larger than this will result in TIR
14. Chemiluminescence occurring in living animals
15. An object that produces its own light
18. A form of energy emitted from the nuclear reactions on the Sun’s surface
19. Light produced as a product of a chemical reaction; cold light
22. Flat reflective surface
24. The bending or changing direction of a light ray as it moves from one medium into another with a different index of refraction