Sun's halo is produced by the refraction of light in: 

(a) water vapour in Stratus clouds 

(b) ice crystals in Cirro-Cumulus clouds 

(c) ice crystals in Cirrus clouds 

(d) dust particles in Stratus clouds

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1 Answers

(d) The ice crystals suspended in cirrus clouds (5-10 k.m.) in the upper atmosphere are responsible for sun’s halo.

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