Do rainbows exist? I assume rain drops and sunlight exist, but the rainbow is

Do rainbows exist? I assume rain drops and sunlight exist, but the rainbow is

Do rainbows exist? I assume rain drops and sunlight exist, but the rainbow is not a collection of rain drops, nor a region of the atmosphere where passing rain drops get some colour, is it? Should we say that rainbows are optical illusions? Or what?

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