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Light

TermDefinition
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