Question

derive lens maker's formula for convex lens

Answer 1

Lens formula
1/f = 1/v - 1/u
where ,
f = focal length
v = image distance
u = object distance

Answer 2

Hello friend.
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:

Principal Axis Concave Lens


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.