Physics
'Parsec' is the unit measurement of

Brightness of heavenly bodies
Astronomical distance
Orbital velocity of giant stars
Density of stars

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

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