Question

what is means of newton's formula and define it​

Answer 1

Answer:

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.

Explanation:

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Answer 2

Answer:

In symbols, the magnitude of the attractive force F is equal to G (the gravitational constant, a number the size of which depends on the system of units used and which is a universal constant) multiplied by the product of the masses (m1 and m2) and divided by the square of the distance R: F = G(m1m2)/R2.