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Colours In Materials


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Explain the science behind the seen of object to the human eye, the light wave behavior and the light phenomena

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Colours In Materials

  1. 1. Colours In MaterialsIndustrial Information technologyGroup -036/17/2013 1
  2. 2. What Is Light ?Light is simply a name for a range ofelectromagnetic radiation that can bedetected by the human eye.Electromagnetic radiation has a dual nature asboth particles and waves.Brightness and Colour of the light aredepend on amplitude and wavelength inelectromagnetic wave.6/17/2013 2
  3. 3. Visible Spectrum6/17/2013 3
  4. 4. Mechanical wavesLangitiudinal waves  Transverse waves6/17/2013 4
  5. 5. The Role of Light to Sight The object is absorbingall the other colors oflight except the ones wesee, which are reflectedback to our eyes Human eyes containsets of cells thatrecognize colorspectrum range of 400-750 nm.6/17/2013 5
  6. 6. Light phenomenareflection refraction6/17/2013 6
  7. 7. Reflection Is a light ray strikes asmooth surface, such as amirror, and bounces off. This is happening accordingto the low of Reflection.6/17/2013 7
  8. 8. Total internal reflection. The larger the angle to thenormal, the smaller is thefraction of light transmitted,until the angle when totalinternal refraction (blue line)occurs. (The color of the raysis to help distinguish the rays,and is not meant to indicateany color dependence.)6/17/2013 8
  9. 9. Diamond6/17/2013 9
  10. 10. MIRAGE• A mirage is a naturallyoccurring opticalphenomenon in whichlight rays are bent toproduce a displacedimage of distant objectsor the sky.• 1.Inferior mirage• 2.Highway mirage• 3.Superior mirage6/17/2013 10
  11. 11. 6/17/2013 11
  12. 12. Refraction Light rays bend at theinterface between twodissimilar media and may becurved in a medium in whichthe refractive index changes. The angle of refraction, of thelight wave depends on howmuch the material slowsdown the light.6/17/2013 12
  13. 13. A rainbow White light separatesinto different Colourson entering theraindrop due todispersion, causing redlight to be refracted lessthan blue light.6/17/2013 13
  14. 14. Dispersion of Light by Prisms When the white lightgo thoght the prism it Blue light refracts morethan red light todeviate from is originalpath by a greater anglethan the red light.6/17/2013 14
  15. 15. Thank You6/17/2013 15