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Suppose F' and F' are the front and rear...

Suppose `F`' and `F`' are the front and rear focqal points of an optical system, and `H`' and `H'` are its front and rear principle points. By means of plotting relative positions of the points `S, F, F', H,` and `H'`:
(a) `FSHH'F'`, (b) `HSF'FH'`, (c) `H'S'FH`, (d) `F'H'SHF`.

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Here we do not assume that the media on the two sides of the system are the same.



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