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Newton's formula

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Newton's formula
An expression relating the focal lengths of an optical system (f and f′) and the object x and image x′ distances measured from the respective focal points. Thus,
ff′ = xx′
If the optical system is a lens in air −f = f′ and the formula becomes
−f2 = xx′
Syn. Newton's equation; Newton's relation. See fundamental paraxial equation; sign convention; gaussian theory.


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