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I don't understand this image or why primary rainbow has red at the top even though in a single drop red is deviated most.

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    $\begingroup$ Refraction for the blue (violet) light must be stronger than for the red. Where did you get these numbers (40-42 deg) from? $\endgroup$ – sleepy Jun 11 at 8:20
  • $\begingroup$ No, (40-42) are the angles at which the light emerges after second refraction wrt incoming white light. I realize the wording in the question isn't proper. $\endgroup$ – adamantane Jun 12 at 8:34
  • $\begingroup$ My answer here might also be helpful. $\endgroup$ – Philip Jun 12 at 8:50
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You only see the color that aims at you. From the higher drops that is red. From the lower drops that is violet.

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  • $\begingroup$ Thanks got it, that is also why rainbows are curved right? $\endgroup$ – adamantane Jun 12 at 8:30
  • $\begingroup$ Yes that’s right. You see a given color only from drops that are at a specific angle to you relative to the sun’s position. $\endgroup$ – geshel Jun 13 at 0:12

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