An object is 18cm in front of a diverging lens that has a focal length of -12cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 2.0?
1/do + 1/di = 1/f
The Attempt at a Solution
i keep solving and getting 36 using those equations, but the answer says its 48 ...i donno how to get 48
1/18 + 1/di = 1/-12