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Why can cirrostratus clouds produce a halo around the Sun or Moon?

Answer and explanation

Correct answer: Because their ice crystals can refract light

Correct answer: C. Cirrostratus is a thin, high cloud made mainly of ice crystals. When sunlight or moonlight passes through suitably shaped ice crystals, the light can be refracted, or bent, and sometimes reflected. The geometry of the crystals and the direction of the incoming light can produce a bright circular halo around the Sun or Moon. C is correct because the optical effect depends on ice crystals in the high cloud. A is wrong: cirrostratus is generally thin and not completely dark, and low water droplets do not explain the typical halo. B is wrong because the phenomenon concerns light, not sound. D is wrong because an empty layer without particles could not refract light. Never look directly at the Sun to observe a solar halo; use safe viewing practices. Memory cue: high ice cloud plus bent light equals halo.

Related tags

CirrostratusHaloIce CrystalsLight RefractionClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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