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## Homework Statement

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?

## Homework Equations

1/do + 1/di = 1/f

m= -di/do

## 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

di=7.2

m= -7.2/18

m=-.4

1/2m=-0.2

-.2= -7.2/do

do=36

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