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lec5 - Interaction of light and matter Any object or...

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Interaction of light and matter ± Any object or surface receiving light absorbs part of it: α [ %] reflects part of it: ρ [ %] may transmit part of it: τ [ %] α + ρ + τ = 100% reflection transmission absorption
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Interaction of light and matter ± Absorption general selective
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Interaction of light and matter ± Absorption ± Reflection
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Interaction of light and matter ± Absorption ± Reflection specular i = r Figures by MIT OCW. C O N C AV E C O N V E X T T i r A A C F f C φ φ F i r C f i r
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Interaction of light and matter ± Absorption ± Reflection specular spread diffuse compound Specular Diffuse/Specular Specular/Spread Diffuse/Spread Spread Diffuse Figure by MIT OCW.
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Interaction of light and matter ± Absorption ± Reflection Anodised aluminium White paint Plaster / white coating (new) Brushed aluminium Worn white coating White acoustical panels White tiling Light birch, ash, maple Pinewood (new) Ecru loth New concrete / light wood fiber (worn) Mahogany, walnut Light grey carpet Earthenware tiling, oak floor (worn)
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