| normal | | allowing light to pass through |
| radiates | | the emission of visible light by a hot object |
| phosphorescence | | to send out energy in the form of waves or rays |
| refraction | | the emission of light produced by chemical reactions inside the bodies of living creatures |
| non-luminous | | the likeness of an object |
| flourescence | | giving off its own light |
| opaque | | a single line or narrow beam of light that originates from a light source and that may bounce off a surface that it strikes |
| angle of reflection | | the transfer of radiant energy; such as light |
| transparent | | the light that is cast back from a reflecting surface |
| bioluminescence | | a flat or level surface |
| laws of reflection | | energy transferred or emitted as waves or rays in all directions |
| angle of refraction | | an object that can be heated to such a high temperature that it emits visible light |
| luminous | | a mirror having a flat surface |
| plane | | a substance that does not give off its own light |
| incandescence | | representation of the path of light by using a straight line with an arrow |
| natural light source | | the angle between the normal and the refracted rays |
| translucent | | the process in which high energy, invisible ultraviolet light is absorbed by the particles of an object |
| radiation | | the light that strikes a reflecting or refracting material |
| plane mirror | | the angle between the incident ray and the normal |
| incandescent source | | the persistent emission of light following exposure to and removal of a source of radiation |
| ray | | not allowing any light to pass through |
| image | | a reference line drawn perpendicular to a reflecting surface at the point where an incident ray strikes the surface |
| angle of incidence | | the angle between the normal and the reflected rays |
| radiant energy | | the bending of light when it travels from one material to another |
| chemiluminescence | | a non-human-mande source of light, such as the sun |
| incicdent ray | | allowing some light to pass through. |
| light | | the casting back of light from a surface |
| ray diagram | | The two laws that state the the angle of reflection is equal to the angle of incidence and the incident ray, the normal and reflected rays are always in the same plane. |
| artificial light source | | the form of energy we can see |
| reflected ray | | a human made source of light |
| reflection | | the emission of light resulting from chemical action and not involving heat |
