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## Homework Statement

A convex mirror of focal length 10cm forms an image that is one quarter the size of the object. Find the position of the object and the image.

## Homework Equations

-1/f = 1/u + 1/v

m = v/u

## The Attempt at a Solution

m = 1/4

f = 10cm

-1/10 = 1/u + 1/0.25u

I think that 1/u + 0.25u is the problem because I cant find the common denominator. The answer to the question is u = 30cm, v = 7.5cm just in case someone thinks I want them to do my homework for me. I just want to understand how to get it. Thanks.