Lights & Lasers

5. A convex lens bends light rays inward, which results in the object being perceived as larger or closer.
6. Infrared light is one type of light that is invisible to us.
11. Alternate exterior angles are two angles that are on the exterior of and , but on opposite sides of the transversal.
12. a particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.
13. A concave lens is a lens that possesses at least one surface that curves inwards.
14. the fact or phenomenon of light, radio waves, etc., being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
15. the rate at which something occurs or is repeated over a particular period of time or in a given sample.

1. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
2. a device that generates an intense beam of coherent monochromatic light (or other electromagnetic radiation) by stimulated emission of photons from excited atoms or molecules. Lasers are used in drilling and cutting, alignment and guidance, and in surgery; the optical properties are exploited in holography, reading bar codes, and in recording and playing compact discs.
3. the range of wavelengths or frequencies over which electromagnetic radiation extends.
4. the action or process of magnifying something or being magnified, especially visually.
7. the angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.
8. (of a line) intersecting a system of lines.
9. the throwing back by a body or surface of light, heat, or sound without absorbing it.
10. ltraviolet is relating to electromagnetic radiation with wavelengths shorter than visible light.