Question

4. What is lens formula?​

Answer 1

Answer:

What is Lens Formula? In optics, the relationship between the distance of an image (v), the distance of an object (u), and the focal length (f) of the lens is given by the formula known as Lens formula. Lens formula is applicable for convex as well as concave lenses. These lenses have negligible thickness.

Explanation:

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Answer 2

Answer:

$\frac{1}f = \frac{1}{v} + \frac{1}{u}$

is a lens formula