Question

what is lens formula......

Answer 1

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. It may be written as: 



       Where,   v   =   Distance of image from optical centre of lens
                     u   =   Distance of object from optical centre of lens
       and         f   =   Focal length of lens 

       The lens formula is applicable both in convex lenses and concave lenses. 

Answer 2

1/f =1/v- 1/u

mark me as the brainliezt