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Light
| Term | Definition |
|---|---|
| waves | one way in which energy travels from one place to another |
| light sources | objects which give off their own light |
| electromagnetic waves | radio, micro, infra-red and ultra-violet waves are examples |
| light | a type of energy which illuminates things |
| absorb | occurs when light rays are taken in by an object |
| refract | occurs when light rays bend as they pass into a medium |
| transparent | lets all light pass through |
| energy | not a substance you can touch, but it has many forms |
| opaque | lets no light rays pass through |
| light ray | a stream of light waves |
| shadow | area where no light rays reach |
| penumbra | an area partly in shadow |
| medium | space or substance light can travel through |
| reflect | occurs when light rays bounce off an object |
| translucent | lets some light through |
| laser light | a concentrated stream of single-colour light rays |
| umbra | area of total shadow |
| laterally inverted | an image where left and right sides of the object are swapped |
| virtual image | occurs when light rays don't pass through where the image is |
| 1st Law of Reflection | the normal, incident and reflected rays lie in the same plane |
| reflection | occurs when light rays bounce off the surface of an object |
| incident ray | an incoming light ray |
| normal | an imaginary line at 90 degrees to where a light ray hits a surface |
| angle of reflection | the angle between the reflected ray and the normal |
| erect | an image that is the right way up |
| 2nd Law of Reflection | the angle of reflection equals the angle of incidence |
| image | a view of an object at a place other than where the object is |
| angle of incidence | angle between the incident ray and the normal |
| plane mirror | a mirror with flat surfaces |
| real image | occurs when light rays pass through where the image is |
| refracted ray | a light ray whose direction has been changed |
| illusion | image of an object which tricks our eyes |
| relative density | density of a substance compared to water |
| optical density | affects the speed at which light rays travel in a medium |
| prism | triangular block of glass |
| reflected ray | ray which bounces off a surface |
| scatter graph | graph with plotted points only |
| critical angle | angle of incidence which gives an angle of refraction of 90 degrees |
| total internal reflection | when light is completely trapped within a medium |
| variable | factor which can change in an experiment |
| optical instruments | objects such as binoculars, cameras and telescopes |
| refraction | a change in the direction of light as it enters a new medium |
| angle of refraction | angle between the refracted ray and the normal |
| right angle | a 90 degree angle |
Created by:
MissEichler
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