1. What is Light?
1.1. Light
1.1.1. The form of energy we can see.
1.2. Natural Light Source
1.2.1. A non-human made source of light,such as the sun.
1.3. Radiates
1.3.1. To send out energy in the form of wave or rays.
1.4. Radiation
1.4.1. The transfer of radiant energy, such as light.
1.5. Radiant energy
1.5.1. Energy transferred or emitted as waves or rays in all directions.
1.6. Artificial light source
1.6.1. A human-made source of light.
1.7. sources of light
1.7.1. Incandescent sources
1.7.1.1. incandescent sources
1.7.1.1.1. an object that can be heated to such a high temperature that it emits visible light.
1.7.1.2. incandescence
1.7.1.2.1. the emission of visible light by a hot object
1.7.2. Fluorescent sources
1.7.2.1. fluorescence
1.7.2.1.1. the process in which high-energy, invisible ultraviolet light is absorbed by the particles of an object, which then emits some of this energy as visible light, causing the object to glow.
1.7.3. Phosphorescent sources
1.7.3.1. phosphoresence
1.7.3.1.1. the persistent emission of light following exposure to and removal of a source of radiation.
1.7.4. chemiluminescent sources
1.7.4.1. chemiluminecenese
1.7.4.1.1. the emission of light resulting from chemical action and not involving heat.
1.7.5. Bioluminescent sources
1.7.5.1. bioluminescence
1.7.5.1.1. the emission of light produced by chemical reactions inside the bodies of living creatures
1.7.5.2. luminous
1.7.5.2.1. giving off its own light
1.7.5.3. non-luminous
1.7.5.3.1. a substance that does not give off its own light.
1.8. The Ray Model of Light
1.8.1. Ray Model
1.8.1.1. a model of light based on the observation that light travels in a straight line
1.8.2. ray
1.8.2.1. a single line or narrow beam of light that originates from a light source and that may bounce off a surface that it strikes
1.8.3. Ray diagram
1.8.3.1. a representation of the path of light by using a straight line with an arrow
1.8.4. transparent
1.8.4.1. allowing light to pass through.
1.8.5. translucent
1.8.5.1. allowing some light to pass through. The light, however, is scattered from its straight path.
1.8.6. opaque
1.8.6.1. not allowing any light to pass through
2. refraction
2.1. Refraction Def: bending of light passing from one medium to another
2.2. angle of refraction def: the angle made by a refracted ray
3. Reflection
3.1. Incident Ray
3.1.1. the light that strikes a reflecting or refracting material
3.2. Normal
3.2.1. a reference line drawn perpendicular to a reflecting surface at the point where an incident ray strikes the surface
3.3. Angle of Incidence
3.3.1. in optics, the angle between the incident ray and the normal
3.4. Angle Of Reflection
3.4.1. in optics, the angle between the normal and the reflected ray
3.5. Plane Mirror
3.5.1. a mirror having a flat surface
3.6. Law of Reflrction
3.6.1. The two main predictable behaviors of reflected light: 1. The angle of reflection (r) is equal to the angle of incidence (i). 2. The incident ray, the normal, and the reflected ray are always in the same plane.
3.7. Convex
3.7.1. curving outwards
3.8. Virtual
3.8.1. the image that you see in relflective surfaces