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Light definitions

TermDefinition
Opaque Substance that doesnt allow light rays to pass through.
Luminous Shining or glowing by producing its own light.
Non-luminous Something that doesnt make its own light.
Light transmission When light passes through an object.
Transparent A material that allows light to pass through.
Light absorption When an object takes in the energy from light.
Transverse wave A wave where the particles of the medium move up and down or side to side which is at a right angle to the direction the wave travels.
Wavelength The distance between two identical points on a wave.
Amplitude A measurement of how far a wave moves from its resting point or how "big" the wave is.
Speed of light The speed at which light and all other electromagnetic radiation travels through a vacuum.
Light year A unit of distance, not time, that measures how far light travels in one year.
Electromagnetic spectrum The entire range of energy that travels in waves from long radio waves to very short gamma rays.
Visible light The part of the electromagnetic spectrum that our eyes can see, like the colors in a rainbow.
Gamma rays A type of invisible high-energy light like a powerful version of the light from the sun.
Radio waves A type of energy that travels in waves through air.
X-Rays A medical imaging technique that uses electromagnetic radiation to create pictures of inside the body.
Infrared waves A type of electromagnetic radiation with wavelengths longer than visible light but shorter then microwaves.
Microwaves A type of electromagnetic radiation with wavelengths between 1 millimeter and 1 meter and corresponding frequencies between 300 MHz and 300 GHz
Ultraviolet rays A type of invisible energy from the sun that can cause skin damage, sunburn, premature aging and skin cancer.
Refraction When light bends as it moves from one transparent material to another.
Reflection When something bounces back like a mirror creating a copy of you or when light bounces of an object so you can see it.
Incident ray (angle of incidence) The ray of light that travels towards and strikes the surface. The angle of incidence is the angle measured between the incident ray and the normal.
Reflected ray (angle of reflection) The ray that bounces off a surface. The angle of reflection is formed between this reflected ray and the normal.
Translucent An object that allows some light to pass through but not all of it.
Penumbra The lighter, grayer part of a shadow that surrounds the dark central area called the Umbra
Umbra The darkest, central part of a shadow where the light is completely blocked.
Created by: magaw
 

 



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