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[–] 4 points 9 months ago (2 children)
  • [–] 1 point 9 months ago* (1 child)

    I think his argument only holds for lenses, not mirrors.

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  • [–] 1 point 9 months ago

    Read the "What if", it is really interesting!

    It explains why this holds for any optical system, including mirrors, showing it with a whole bunch of wildly different explanation approaches.

    I even understood one or two of those... ;-)

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