I HAVE A DOUBT ON LENS FORMULA AND I ALSO HAVE A DOUBT IN PROBLEMS RELATED TO MIRROR FORMULA AS WELL AS LENS FORMULA
1/f=1/v-1/u
Where,
v = Distance of image from optical centre of lens
u = Distance of object from optical centre of lens
f = Focal length of lens
1/f =1/v+1/u
Where
U = Object distance
V = Image distance
F = Focal length
hope it help you