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:*[[Reflection]] - An [[object]] may [[reflect]] some [[frequency|frequencies]] while [[Absorb (Physics)|absorbing others]].
:*[[Colour Filter|Filtering]] - An [[object]] may be viewed through a [[transparent]] [[medium]] which [[Absorb (Physics)|absorbs]] certain [[frequency|frequencies]] of [[light]].
:*[[Scattering]] - An [[object]] may be viewed through a [[transparent]] [[medium]] which [[Scattering|scatters]] certain [[frequency|frequencies]] of [[light]]. This is why the [[sky]] appears blue and the [[Sun]] appears yellow.
===Eyes and Colour===