Monochrome Rainbows: In The Right Circumstances, Rainbows Can Look Very Strange IndeedYou probably all know how rainbows form, if not from being told as a child, then from having to explain it to a child as an adult. But here's the basic version anyway in case you, uh, forgot.The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.Light in a vacuum –...
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