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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References in periodicals archive ?

86 for the deflection, about in line with Newton's formula, but with large uncertainties.

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Hu Ning according to general relativity and Binet's formula, we get the following improved Newton's formula of universal gravitation

3] Fu Yuhua, Improved Newton's formula of universal gravitation, Ziranzazhi (Nature Journal), 2001(1), 58-59

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3 With the help of general relativity and accurate experimental data to derive the improved Newton's formula of universal gravitation

Hu Ning derived an equation according to general relativity, with the help of Hu's equation and Binet's formula, we get the following improved Newton's formula of universal gravitation[2]

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0] for G in Newton's formula, the gravitational potential energy Ug stored in a system of masses M and m separated by a distance r can be expressed as:

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There are the two following analogues of Newton's formula (3.

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It's about as scientific as reading monkey bones, but some minds don't buy Newton's formula wholesale.

STICKBOW

In particular, the unified field theories say that the force of attraction between two bodies is given by Newton's formula plus a much smaller "fifth force" that seems to come into play at distances of about 100 to 1,000 meters.

Geophysics on the fifth force's trail

Hu Ning derived an equation according to general relativity, with the help of Hu's equation and Binet's formula, in reference [8] we derived the following improved Newton's formula of universal gravitation