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Why is Water Blue?
Posted November 24th, 2007 by Lindsay
As white light travels through water it is not only refracted and scattered, it is absorbed or 'attenuated' by the water. Varying wavelengths, or colours, are absorbed at differing depths; organic matter also adding to this absoption.
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Sea Shadow
Posted November 24th, 2007 by Lindsay
If water absorbs light wavelengths at differing depths, giving the appearance of either a green or blue topography, would a shadow created at the surface still be visible at depth as long as there is light? Is a shadow in effect a Faraday cage for visible light, creating a negative space or an absence, a 'border' through which this type of electromagnetic energy cannot pass?
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