why sea water is blue in colour
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Water is colourless. It is due to the reflection of the sky it looks blue in colour.
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When sunlight hits the surface of water , some of the light gets reflected back, whereas, most of the longer wavelengths such as red, orange and yellow penetrate sea water and get absorbed by the water molecules. So only the shorter wavelengths of light which contain violet and blue colors are reflected back to reach our eyes. Hence water appears blue.
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