Physics
Rainbows are produced when sunlight :

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.
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.

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Physics
The Hooke's law is valid for

Entire stress strain curve
Only proportional region of the stress strain curve
Entire elastic region of the stress strain curve
Elastic as well as plastic region of the stress strain curve

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