17_light - Light Light Color Color Color Addition...

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Unformatted text preview: Light Light Color Color Color Addition & Subtraction Color Addition & Subtraction Spectra Spectra Spring 2006 UCSD: Physics 8; 2006 2 What What do we see? do we see? Our eyes cant detect intrinsic light from objects (mostly Our eyes cant detect intrinsic light from objects (mostly infrared), unless they get infrared), unless they get red hot red hot The light we see is from the sun or from artificial light The light we see is from the sun or from artificial light When we see objects, we see When we see objects, we see reflected reflected light light immediate bouncing of incident light (zero delay) Very occasionally we see light that has been absorbed, Very occasionally we see light that has been absorbed, then re-emitted at a different wavelength then re-emitted at a different wavelength called fluorescence, phosphorescence, luminescence Spring 2006 UCSD: Physics 8; 2006 3 Colors Colors Light is characterized by frequency, or more Light is characterized by frequency, or more commonly, by wavelength commonly, by wavelength Visible light spans from 400 nm to 700 nm Visible light spans from 400 nm to 700 nm or 0.4 m to 0.7 m; 0.0004 mm to 0.0007 mm, etc. Spring 2006 UCSD: Physics 8; 2006 4 White light White light White light is the combination of all wavelengths, with White light is the combination of all wavelengths, with equal representation equal representation red hot poker has much more red than blue light experiment: red , green , and blue light bulbs make white R G B monitor combines these colors to display white white blue light green light red light wavelength combined, white light called additive color combinationworks with light sources Spring 2006 UCSD: Physics 8; 2006 5 Additive Colors Additive Colors Red Red , , Green Green , and , and Blue Blue light light sources can be used to sources can be used to synthesize almost any synthesize almost any perceivable color...
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17_light - Light Light Color Color Color Addition...

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