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Why does water in deep-sea seem to be bluish?

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The blue colour of the sky, colour of water in deep sea, the reddening of the sun at sunrise and the sunset are some of the wonderful phenomena due to scattering of light.

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Sea has many tiny particles to scatter light. The sunlight is made up of seven colours, most of the longer wavelength lights (red, orange, yellow etc.) present in it do not get scattered much and hence pass straight through. The shorter wavelength blue light is however scattered all around. The scattering of the blue component of the white sunlight by tiny molecules causes the blue colour of the sea.

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