Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Interference of the sun light from water surface

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

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

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