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
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
A transverse wave superposing a longitudinal wave
Two waves of the same speed superposing
Two waves of same frequency travelling in the same direction

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