Physics
Rainbows are produced when sunlight :

Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
None of the given statements is correct.

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Physics
Why does the sea appear blue in colour?

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

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Physics
The sky appears blue because

It is actually blue
All colours interfere to produce blue
The atmosphere scatters blue colour more than the others
In white light, the blue component dominates

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