Question

what is called lens formula? derive lens formula
$\frac{1}{v } - \frac{1}{u} = \frac{1}{f}$

Answer 1

derive lens maker's formula. It is a relation that connects focal length of a lens to radii of curvature of the two surfaces of the lens and refractive index of the material of the lens.

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Answer 2

A lens formula may be defined as the formula which gives the relationship between the distance of image (v), distance of object (u), and the focal length (f) of the lens.