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What causes haloes (rings) around the sun or the moon?

What causes haloes (rings) around the sun or the moon? Correct Answer Reflection of light

When the sun or the moon is seen through a thin veil of high clouds, haloes, i.e. rings, are seen. These are formed due to the reflection of light by the icy crystals present in the atmosphere. So, this is the cause of rings around the sun or the moon.

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