| 释义 |
Newton's formula Newton's formulaAn 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. |