Light Science 8 Flashcards
image
a representation of the external form of a person or thing in art.
light
the natural agent that stimulates sight and makes things visible
natural light source
Natural sources of light include the sun, stars, fire, and electricity in storms.
radiates
emit (energy, especially light or heat) in the form of rays or waves.
radiation
the transfer of energy in the form of electromagnetic
waves
radiant energy
radiant energy, the energy that is transferred by electromagnetic radiation, such as light, X-rays, gamma rays, and thermal radiation
artificial light source
Details on the development of artificial light, including the incandescent bulb, fluorescent lighting and LED lighting
incandescent source
The incandescent light bulb or lamp is a source of electric light that works by incandescence
incandescence
État d’un corps incandescent.
fluorescence
Fluorescence is the ability of certain chemicals to give off visible light after absorbing radiation which is not normally visible, such as ultraviolet light.
phosphorescence
Phosphorescence is a type of photoluminescence related to fluorescence. When exposed to light (radiation) of a shorter wavelength, a phosphorescent substance will glow
chemiluminescence
Chemiluminescence (CL) is defined as the production of electromagnetic radiation (ultraviolet, visible or infrared)
bioluminescence
Bioluminescence is the production and emission of light by a living organism. Bioluminescent creatures are found throughout marine habitats
ray
each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.
ray diagram
A ray diagram is a representation of the possible paths light can take to get from one place to another. This is often from a source or object to an observer or screen.
transparent
(of a material or article) allowing light to pass through so that objects behind can be distinctly seen.
translucent
(of a substance) allowing light, but not detailed shapes, to pass through; semitransparent.
opaque
not able to be seen through; not transparent.
luminous
full of or shedding light; bright or shining, especially in the dark.
non-luminous
: not emitting light : not luminous The results also suggest this galaxy contains a substantial amount of nonluminous matter.
reflection
the throwing back by a body or surface of light, heat, or sound without absorbing it.
incident ray
An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.
reflected ray
Reflected ray. A ray of light or other form of radiant energy which is thrown back from a nonpermeable or nonabsorbing surface; the ray which strikes the surface before reflection is the incident ray.
Normal line
The normal line is defined as the line that is perpendicular to the tangent line at the point of tangency.
angle of incidence
In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal.
angle of reflection
: the angle between a reflected ray and the normal drawn at the point of incidence to a reflecting surface.
plane mirror
A plane mirror is a mirror with a flat reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.
law of reflection
The normal line divides the angle between the incident ray and the reflected ray into two equal angles.
plane
An airplane or aeroplane is a fixed-wing aircraft that is propelled forward by thrust from a jet engine, propeller, or rocket engine.
refraction
In physics, refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.
angle of refraction
According to Snell’s law, the angle of refraction, θr, depends on the angle of incidence, θi, and the ratio of the refractive indices of the two media that make up the interface.
