NewScientist The Last Word - Tag 'Arcs' details

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Why do rainbows always occur in arcs?
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Categories: Weather .

The sun illuminating scratches on the window of a train produces an arc. Why? This photo was taken on a train travelling south to Hastings. The flat windows had horizontal and vertical scratches, perhaps from cleaning. The arc that is illuminated by the sun appears to be centred on the vanishing point of the axis of the carriage. The Sun lies on the arc. Why this arc?
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