28. Sun’s halo is produced by the refraction of light in:
Water vapour in stratus clouds
Ice crystals Cirro – Cumulus clouds
Ice crystals in Cirro Stratus
Dust particles in stratus clouds
The correct option is C Ice crystals in Cirro Stratus
High thin Cirrus clouds drifting 20000 ft or more above our heads contain millions of tiny ice crystals. The halos are caused by both refraction or splitting of light and also by reflection or glints of lights from these ice crystals. These crystals have to be oriented and positioned just so with respect to your eye, in order for the halo to appear.
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