Discussion
Match each physical cause of colour with an example.
List I
A. Selective absorption
B. Interference
C. Scattering
D. Diffraction
List II
1. the blue of the clear daytime sky
2. a dye absorbing the middle of the spectrum
3. the spectrum from a compact disc surface
4. the iridescence of a soap film or beetle
Answer: B
Colour arises from several quite different physical mechanisms. Structural colours from interference and diffraction shift with the viewing angle in a way absorption colours do not. Geometry governs one and chemistry the other.
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