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Light & Color

Light & Color. Light:. Light that can be sensed by our eyes is Visible Light Visible light consists of a continuous range of wavelengths or frequencies Specific wavelengths correspond to a specific color based upon how we perceive light of that wavelength . Dispersion & Recomposition:.

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Light & Color

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  1. Light & Color

  2. Light: • Light that can be sensed by our eyes is Visible Light • Visible light consists of a continuous range of wavelengths or frequencies • Specific wavelengths correspond to a specific color based upon how we perceive light of that wavelength

  3. Dispersion & Recomposition: • If a prism is placed in a beam of white light:

  4. Dispersion occurs resulting in the ‘separation’ of light into a spectrum of colors • A type of refraction • Refractive index varies with the wavelength or color of light • Dispersion due to different refractive angles • How rainbows occur

  5. Recomposition recombines the colors of the spectrum

  6. When light strikes an object, the specific wavelengths can be absorbed or reflected • The wavelengths that are reflected by an object, cause the perceived color of the object • Ex. ROYBIV all absorbed by object G reflected Therefore object “appears” green G ROYGBIV Capable of absorbing ROYBIV

  7. If all absorbed, then object appears black • If all reflected, then object appears white

  8. Ex. What color will the objects appear to be? RO GBIV ROYGBIV ROYGBIV ROYGBIV nothing BLACK Capable of absorbing ROY Capable of absorbing YGBIV Capable of absorbing ROYGBIV

  9. Viewing objects: • Objects may be viewed through filters &/or under different light • Causing the color of objects to be perceived differently • Recall white light is ROYGBIV

  10. Filterswill only allow specific colors of light (& the color on either side in the spectrum) to pass • Ex. ROYGBV GBV Blue Filter

  11. Ex. White light passes through a yellow filter. What color light will pass? ROYGBV OYG Yellow Filter

  12. Recall colors are perceived b/c of the color of light reflected • Viewing objects under different color light will affect the perceived color since some colors may or may not be present to be reflected!!!

  13. Ex. A white dress is viewed under a blue filer. What color will the dress appear? BLUE ROYGBV GBV Blue Filter

  14. Ex. A yellow shirt is viewed under a green filer. What color will the shirt appear? Yellow ROYGBV YGB Green Filter

  15. Ex. A red shirt is viewed under a yellow filer. What color will the shirt appear? BLACK ROYGBV OYG Yellow Filter

  16. Ex. A blue shirt is viewed under red light. What color will it appear? ROYGBV BLACK

  17. Ex. A blue shirt is viewed under green light. What color will it appear? ROYGBV BLUE

  18. Ex. When the first light is used, he appears to be wearing black shoes, red pants & a red shirt Standing on a stage, a singer is illuminated by three lights, each emitting a different color. When the second light is used, he appears to be wearing blue shoes, black pants & a blue shirt When the third light is used, he appears to be wearing black shoes, black pants & a green shirt What color are the singer’s shoes, pants & shirt?

  19. Reflecting blue so…. Reflecting red so… Reflecting all so… Shoes are blue Pants are red Shirt is white ----- RO RO Red GBV ----- GBV Blue ----- ----- YGB Green

  20. Color Addition: • White light is ROYGBIV but… • White light can also be produced by adding colors (or frequencies) • Any three colors of light which produce white light when combined are primary colors of light • RED, GREEN & BLUE

  21. By adding primary colors of light, other colors can be produced • Ex. • TVs, computers, stage lights Yellow Red Green White Magenta Cyan Blue

  22. Ex. Yellow Magenta Cyan

  23. Any two colors of light which when mixed together in equal intensities produce white are complementary colors of eachother • Ex. • Red & Cyan • Blue & Yellow • Green & Magenta

  24. Ex. If magenta light and yellow light are added together, will white light be produced? Magenta = Red & Blue Yellow = Red & Green Light will appear “light pink”

  25. Color Subtraction: • Process of “removing” color • Increasing absorption of colors and decreasing reflection of colors • Ex. • Paint pigments, printer ink Blue absorbed Red & Green Reflected Therefore object “appears” yellow RGB RG Pigment capable of absorbing blue light

  26. Ex. What color would an object capable of absorbing blue light appear? Green absorbed Red & Blue Reflected Therefore object “appears” magenta RGB RB Pigment capable of absorbing green light

  27. Primary colors (pigments) of paint are cyan, magenta & yellow Blue Cyan Magenta Cyan absorbs Red Magenta absorbs Green Yellow absorbs Blue Green Red Yellow Each primary color of paint absorbs one primary color of light

  28. Try: Worksheet

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