Thursday, January 10, 2013

A Deep Blue

A Deep Blue - 5D3, 400 f/2.8 IS II, f/4, 1/1600s, ISO 100
I never to cease to be amazed by the incredibly deep blue color of icebergs.  One may wonder why icebergs have this blue color but your ice from the grocery store or snow remains white.  The reason is air.  Water itself has high absorption in the red end of the visible spectrum, however in snow and regular ice there are lots of tiny pockets of air and all those air/water interfaces causes light to get heavily scattered and hence reflected back.  However, glacier ice being under a lot of pressure has a lot of those air bubbles squeezed out and so the light can travel deeper without hitting air bubbles resulting in more of the red end of the spectrum absorbed, which in turn to us appears blue.  And if all that is confusing, forget everything I said and enjoy the pretty picture :)
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