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Session 3 lecture outline
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Dispersion

  1. 1. PANCHAYAT UNION MIDDLE SCHOOL, VISWANATHAM SIVAKASI UNION, VIRUDHUNAGAR DISTRICT, TAMILNADU STATE, INDIA-626124. CELL NO 97510-45246. Exit
  2. 2. Dispersion Dispersion of White light Colours Colour Filters Home Mixing Colour or Spectral Colours Colour Blindness – An Activity Mixing of Colours – An Activity Newtons’ Colour Disc PHYSICS
  3. 3. The phenomenon by which a ray of light splits into its constituent colours when 00is passed through a it transparent medium is known as dispersion. Red Orange Range of Yellow Visible Green Spectrum Blue 0.4 microns to Indigo 0.7 microns Violet Spectrum is the band of colours obtained due to the dispersion of Light. Rainbow
  4. 4. Sun Sun light Rainbow
  5. 5. Pigment is an optically active substance which may be synthetic or of Mineral animal or vegetable origin.
  6. 6. Pigment is sensation produced in the brain due to the excitation of retina, by Colour is a an optically active substance which may be synthetic or of Mineral animal or vegetable origin. electromagnetic waves. The range of wavelength of these waves is 4000Å to 8000Å Angstrom (Å) : It is the unit used to measure wavelength of electromagnetic radiation. 1 Å =10-10 m =10-8 cm
  7. 7. Red Orange Yellow Green Blue Indigo Violet Primary Colours Red Blue Green
  8. 8. The Primary colours are the white light. Colours which when mixed in equal proportions give white light. ctor Projector r cto je oje Pro Pr
  9. 9. The colours obtained by the mixing two primary colours are called Secondary Colors Secondary Colours Cyan Magenta Yellow
  10. 10. Pro je ctor Red + Green = Yellow Projector Yellow r cto Pr oje
  11. 11. Red + Blue = Magenta Magenta ctor Projector r cto je oje Pro Pr
  12. 12. Pro je ctor Green + Blue = Cyan Projector r cto Pr oje Cyan
  13. 13. The Secondary colours are obtained by projecting light of one colour on the other and the rocess is known as colour mixing by addition. The colurs thus obtained are called additive colours Cyan Magenta Yellow
  14. 14. Complementary Colours can be defined as pair of colours one primary and other secondary colour, which on mixing forms white light. Secondary Colours are known as subtractive primaries as they are obtained by subtracting one of the primary colours from white light. White White White
  15. 15. Yellow + Green = White White ctor Projector r cto je oje Pro Pr
  16. 16. Pro je ctor Green + Cyan = White Projector r cto White Pr oje
  17. 17. Pro je ctor Red + Cyan = White Projector White r cto Pr oje
  18. 18. Colour Triangle Primary Colours Secondary Colours Red Magenta Green Yellow Blue Cyan Cyan The order of the colours is such that the sum of any two primary colours at the Corners gives the secondary colors between them. The sum of the primary colour on the vertex and the secondary colour on the side opposite to the vertex produces white light.
  19. 19. The Rod shaped cells are sensitive to brightness of light. The Cone shaped cells orRetina : The retina, the colours.of the human eye, Consists ofsensitive andnumber cones are sensitive to screen There are red sensitive, blue a very large green sensitive cones. Colourare rod shaped cells and cone shaped cells.cones of light sensitive cells. They blind people have less number of particular than people with normal vision. Hence they get colour confused. Retina Rod shaped Cells Cone shaped Cells
  20. 20. If you see the No 12. your vision is normal else not.
  21. 21. Look at this picture and click on the number you see. a) 21 b) 24 c ) 74 d) No number
  22. 22. You have a red green Confusion. Next
  23. 23. You Don’t have a red green Confusion. Next
  24. 24. Look at this picture and click on the number you see. a) 21 b) 24 c ) 74 d) No number
  25. 25. You have a colour deficiency . Next
  26. 26. You Don’t have a colour deficiency . Next
  27. 27. ON ON ON Switch on the light and then click on the appropriate colour Click the Correct colour
  28. 28. ON ON ON Click on the appropriate colour
  29. 29. ON ON ON Click on the appropriate colour Next
  30. 30. ON ON ON Click on the appropriate colour
  31. 31. Home Continue
  32. 32. Home Continue
  33. 33. Continue
  34. 34. Home Continue

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