Physics
Radio telescopes are better than optical telescopes because

they can work during the day and night
they can work even in cloudy conditions
All of these
they can detect faint galaxies which no optical telescope can

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Physics
Rainbows are produced when sunlight :

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

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