Question

explain the lens formula

Answer 1

We obtain lens formula by measuring the size of the object without magnification and the magnified size of the same object when a hand lens has been used. Formula is given by (Y/X )x , where x is the unit of magnification. ... The lens formula is applicable both in convex lenses and concavelenses.

Answer 2

✨ Hey mate ✨

▶Lens formula is - :
$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$

✒Where-:
▶distance of image (v)
▶distance of object (u),
▶and the focal length (f)

✨ Hope it helps ✨