Request for a beta-reader

Anyone out there who knows more about optics than I do and would be willing to beta-read the scene below the cut for egregious errors? Scenario involves someone trying to explain prisms and dispersion to a young child, while trying not to overwhelm her with detail. ETA — no one else responded, and Andrew seemed to think it was ok, so I’ve gone ahead and posted it. Any errors are mine and not Prof. Barker’s.
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