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Light and Color.

Published bySilvester Franklin Modified over 6 years ago

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Presentation on theme: "Light and Color."— Presentation transcript:

1 Light and Color

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

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

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

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

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

7 Electromagnetic Waves

8 Electromagnetic Waves

9 Electromagnetic Waves

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

11

12

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

14 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

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

16 Colors of light Color is individual frequencies of light.

17 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

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

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

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

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

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

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

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

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

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

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

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

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