Discussion
Assertion (A): A halo indicates an ice crystal cloud rather than a water droplet cloud.
Reason (R): The halo arises from refraction through hexagonal ice crystals of a particular geometry.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the optics. The common 22-degree halo is produced by refraction through the sixty-degree prism formed by alternate faces of hexagonal ice crystals, and water droplets cannot do it - being spherical, they produce a corona of coloured rings close around the sun instead. A halo is therefore a reliable statement about the phase of the cloud.
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