**Write the formula for a lens connecting image distance (v) object distance (u) and the focal … does the lens formula differ from the…**

###### Answers:

Formula for a lens connecting image distance (v), object distance (u) and the focal length (f) is:

1/v – 1/u = 1/f

This is the lens formula. The lens formula has a minus sign (-) between 1/v and 1/u whereas the mirror formula has a plus sign (+) between 1/v and 1/u.

Mirror formula:

1/v + 1/u = 1/f