The bluish colour of water in deep sea is due to:

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The presence of algae and other plants found in water

Reflection of sky in water

Scattering of light

Absorption of light by the sea

answer is C.

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Detailed Solution

Concept- Sunlight is absorbed by water molecules, which scatter the many colours. Longer wavelength colours can be easily absorbed, however shorter wavelength colours will disperse. Similar to the phenomena of sky colour is the phenomenon of deep sea colour.
Since the blue colour of deep sea is mainly due to scattering, the correct answer. is option (3) Scattering of light. Rayleigh scattering relates to scattering by small particles, which says scattering ∝1λ4 , where λ is wavelength of scattered particles.
Hence, option 3 is correct.

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