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Light

Light. The Electromagnetic Spectrum. Long to short Radio Microwave Infrared Visible light Ultraviolet X-ray Gamma ray High frequency to low Gamma Ray X-Ray Ultraviolet Visible light Infrared Microwave Radio. Visible Spectrum. Long to short Red Orange Yellow Green Blue

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Light

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Presentation Transcript

  1. Light

  2. The Electromagnetic Spectrum • Long to short • Radio • Microwave • Infrared • Visible light • Ultraviolet • X-ray • Gamma ray • High frequency to low • Gamma Ray • X-Ray • Ultraviolet • Visible light • Infrared • Microwave • Radio

  3. Visible Spectrum • Long to short • Red • Orange • Yellow • Green • Blue • Violet • High frequency to low • Violet • Blue • Green • Yellow • Orange • Red

  4. Color Addition • Three primary colors: Red, Green, Blue • Red + Green = Yellow • Green + Blue = Cyan • Blue + Red = Magenta • Red + Green + Blue = White

  5. Speed, Frequency & Wavelength • In meters/second: • c = 3.0 x 108 m/s • Like other waves, c = fλ

  6. Frequency, Wavelength & Color • 1 nm = • 1 nanometer = • 10-9 m = • one billionth of a meter

  7. Light Intensity • The standard unit of light output is the lumen (lm) • The standard unit of light intensity is the lux (lx) • 1 lx = 1 lm/m2 • I ~ 1/r2

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