Newton's formula

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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