For two-mirror spherical and reversed periscopes, the induced wave-front diffeomorphisms are projectively gradient, and explicit formulas express the second mirror and the map in terms of the first mirror and a constant.
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Two variations on the periscope theorem
For two-mirror spherical and reversed periscopes, the induced wave-front diffeomorphisms are projectively gradient, and explicit formulas express the second mirror and the map in terms of the first mirror and a constant.