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## Homework Statement

An object is placed at 30 cm in front of a diverging lens with a focal length of 10 cm. What is the image distance?

## Homework Equations

1/f = 1/do + 1/di

## The Attempt at a Solution

I thought this was a straight-forward question:

1/di = 1/-f - 1/do

1/di = (1/-10 cm) - (1/30 cm)

1/di = -0.066 cm

di = 1/-0.066 cm = -15 cm

BUT- the answer provided to me states that the answer is -7.5cm. So what is it that I'm missing here?