Physics
It is dangerous to observe Solar eclipse with naked eyes because

Infrared radiations from sun burn our retina
All radiations from sun initiate chemical reactions in eyes
Ultraviolet radiations from Sun burn our retina
Cosmic rays reach eyes more during the eclipse

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Physics
The blue colour of water in the sea is due to

Reflection of blue sky by sea water
Absorption of other colours except blue by water molecules
Reflection of blue light by impurities in sea water
Scattering of blue light by water molecules

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