Physics
Rainbows are produced when sunlight :

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

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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
The sky appears blue because

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

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