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when toggle format what by license comment
Dec 22, 2021 at 6:59 comment added Acccumulation There's a similar phenomenon with lenses: both sides bend the light, and they do it the same way because the slopes are reversed.
Dec 21, 2021 at 17:39 comment added Frederik Steinmetz The first sentence says it all, thanks for the well formated answer, mystery solved.
Dec 21, 2021 at 17:38 vote accept Frederik Steinmetz
Dec 21, 2021 at 14:14 history answered Cross CC BY-SA 4.0