When water droplet is in air as water vapours it scatters blue light, after rain by refraction dispersion and TIR it forms rainbow , in sea it scatters blue light while water in glass ( drinking glass container)doesn't scatter blue light and water appears colourless. Why there are these differences? I am not sure this is a good question , but there must be some reason for these nature's of water droplet. I think the factors like size , etc have a play
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2$\begingroup$ Water is blue, it's just something one wouldn't notice in very small amounts of water. $\endgroup$– TriatticusCommented Nov 7, 2021 at 10:57
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$\begingroup$ Are you sure? Isn't water colourless? $\endgroup$– SidhiCommented Nov 8, 2021 at 15:21
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1$\begingroup$ Yes I am sure, in fact it's such a weak color that water appears colorless on small scales. $\endgroup$– TriatticusCommented Nov 8, 2021 at 20:52
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$\begingroup$ Thanks ,@ triatticus $\endgroup$– SidhiCommented Nov 10, 2021 at 2:46
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