Physics
Rainbows are produced when sunlight :

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

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Physics
Why does the sea appear blue in colour?

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

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Physics
The sky appears blue because

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

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