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Light (Optics)
LC Physics
Term | Definition |
---|---|
Light | Is a form of energy |
Reflection | The bouncing of light off an object. |
Laws of Reflection | 1. The incident ray, the normal and the reflected ray all lie in the same plane. 2. The angle of incidence = the angle of reflection. |
Virtual Image | This is formed by the apparent intersection of light rays. |
Real Image | This is formed by the actual intersection of light rays. |
Refraction | The bending of light when it travels from one medium to another. |
Laws of Refraction | 1. The incident ray, the normal and the reflected ray all lie in the same plane. 2. Sin i is directly proportional to Sin r. |
Critical Angle | This is the angle of incidence when the angle of refraction is 90 degrees and the light ray is travelling from a more dense medium to a less dense medium. |
Total Internal Reflection | When light travelling from a more dense medium to a less dense medium strikes the second medium with an angle of incidence greater than the critical angle then all the light is reflected back internally and no light escapes. |
Optical Fibre | This is a very thin transparent rod through which light can travel by total internal reflection. |
Short Sighted (Myopia) | Person can see nearby objects clearly but cannot bring distant objects into focus. |
Long Sighted (Hyperopia) | Person can see distant objects clearly but cannot bring nearby objects into focus. |