Light and Color.

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Presentation transcript:

Light and Color

Early Concepts Classical Greek Ideas Newton … Particles Streamers Wave diffraction, refraction, etc

Early Concepts Einstein (1905) Photons – mass-less bundles of concentrated electromagnetic (light) energy.

Present Day Dual Nature of Light Light acts like a wave and/or a particle

Electromagnetic Waves Electromagnetic radiation is energy that is emitted by exciting electrons in atoms

Electromagnetic Waves wave – a wave that consists of oscillating electric and magnetic fields

Electromagnetic Waves

Electromagnetic Waves

Electromagnetic Waves

Electromagnetic Waves Electromagnetic spectrum- the whole range of energy waves that may be given off by electrons losing energy

Speed of Light Speed of light for all electromagnetic waves is: c = 3.0 x 108 m/s

Speed of Light Light could travel around Earth 7.5 times in one second. It takes 8 min. for light to travel from the Sun to Earth

Creating Light Illuminated body- body that reflects light waves Luminous body- body that emits light waves Illuminated body- body that reflects light waves

Colors of light Color is individual frequencies of light.

Color Wavelength Frequency Red 650 nm 462 THz Orange 600 nm 500 THz Yellow 580 nm 517 THz Green 530 nm 566 THz Blue 470 nm 638 THz Violet 400 nm 750 THz

Colors of light The primary colors of light are Red, Green and Blue

Colors of light Additive color process – Process of making colors by adding the different primary colors of light

Colors of light The secondary light colors are formed by combining the primary colors in pairs

Colors of light Red + Blue = Magenta Blue + Green = Cyan Green + Red = Yellow

Colors of light Complimentary colors- Two colors of light that, when added, produce white

Colors of light Yellow + Blue = White Cyan + Red = White Magenta + Green= White Cyan + Red = White

Pigments and Filters Pigment –material that absorbs certain colors and transmits or reflects others.

Pigments and Filters Subtractive color process – Process of making colors by subtracting different colors of light

Primary Pigment Absorbs Reflects Yellow Blue Red + Green Cyan Red Blue + Green Magenta Green Red + Blue

Secondary Pigment Absorbs Reflects Blue Red + Green Red Blue + Green Green Red + Blue

Pigments and Filters Complimentary pigments- Two pigments that, when added, produce black