The bright circle around the Sun seen in the picture is known as a halo. What causes it?

refraction of light in ice crystals
refraction in the lens of the eye or lens
refraction of light in water drops
reflections from the water surface
Halo is the name for a family of optical phe­nom­e­na produced by light in­ter­act­ing with ice crystals sus­pend­ed in the at­mos­phere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky. Among the best known halo types are the circular halo (prop­er­ly called the 22° halo), Other common optical phe­nom­e­na in­volv­ing water droplets rather than ice crystals include the glory and the rainbow.

Answers distribution

refraction of light in ice crystals
refraction in the lens of the eye or lens
refraction of light in water drops
reflections from the water surface
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flagCanada
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flagthe Netherlands
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flagItaly
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flagthe United States
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flagGreece
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flagGermany
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flagFrance
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flagIndia
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flagPoland
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flagthe United Kingdom
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flagSweden
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flagUnknown
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flagRepublic of Ireland
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flagNorway
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Gender

men33%
women33%
refraction of light in ice crystals
33%
33%
refraction in the lens of the eye or lens
36%
34%
refraction of light in water drops
24%
24%
reflections from the water surface
5%
7%

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The bright circle around the Sun seen in the picture is known as a halo. What causes it?
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Author: Tschuka
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