as we know that cv raman proved that why is the color of water blue ..................the reason is because of of the reflection of the sky.......................so why is the sky blue?????????????

This is actually a much more complicated question than it appears. Of course, the ocean is not ALWAYS blue, but it is often blue. It is different shades of blue at different times. It appears that the ocean's color is a combination of at least 3 processes: 1. reflection (from the blue sky above) 2. absorption (of other colors) 3. scattering (of the blue part of the spectrum by suspended particles in the water, or by the water itself). One source I found said the scattering was because of the dissolved oxygen but I find that hard to believe. Another said that the scattering was mainly due to Raman scattering. That might be true. The blue of the sky is mainly because of scattering by oxygen and nitrogen (Rayleigh-Tyndall scattering) except at sunrise and sunset, when the ozone apparently absorbs much of the redder and orange colored light, leaving the sky overhead a dark blue. The glass of water is too small a quantity to view the blue color.

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