Question

Please tell me the lens formula

Answer 1

The lens formula is
$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$
where
f is the focal length of lens.
v is the distance of image from the object.
u is the distance of object from the mirror.
For concave lens
v, f, and u is always taken in negative.
For convex lens
u is always taken negative and f is always positive.
v is negative for virtual image and positive for real image.

Answer 2

hi frnd! your answeris as follows,

$\frac{1}{f} = \frac{1}{v} - \frac{1}{u} \\ where \\ f = focal \: length \\ v = imageof \: the \: object \\ u = distence \: of \: object \: placed$
hope it helps uu

please mark it as brainlient answer