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Light
Light, Reflection and Refraction
| Question | Answer |
|---|---|
| electromagnetic wave | a wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light |
| reflection | the change in direction of an electromagnetic wave at a surface that causes it to move away from the surface |
| angle of incidence | the angle between a ray that strikes a surface and the line perpendicular to that surface at the point of contact |
| angle of reflection | the angle formed by the line perpendicular to a surface and the direction in which a reflected ray moves |
| virtual images | an image from which light rays appear to diverge, even though they are not actually focused there; a virtual image cannot be projected on a screen |
| refraction | the bending of a wave front as the wave front passes between two substances in which the speed of wave differs |
| lens | a transparent object that refracts light rays such that they converge or diverge to create an image |
| total internal reflection | the complete reflection that takes place within a substance when the angle of incidence of light striking the surface boundary is greater than the critical angle |
| critical angle | the angle of incidence at which the refracted light makes an angle of 90 degrees with the normal |
| Law of reflection | Angle of Incidence = Angle of Reflection |
| optical fibres | They are commonly used in telecommunication and medicine for transmitting signals and light |
| Ray Digrams | diagram that traces the path that light takes in order for a person to view a point on the image of an object |
| incidence ray | line representing the light travelling into the mirror or glass is called... |
| reflected ray | The ray that reflects off of the mirror and equals the incident ray. |
| Normal line | An imaginary line drawn perpendicular (90 degrees) to a surface. |
| plane mirror | a mirror with a flat surface |
| Law of refraction | when light enters a new medium at an angle, the change in speed cause the light to bend, or refract |
| index of refraction | a measure of the amount a ray of light bends when it passes from one medium to another |
| angle of refraction | The angle between the refracted ray and the normal |
Created by:
Miss_Graham_Science
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