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## Homework Statement

An object 23.0 mm high is 31.0 cm away from a concave spherical mirror with a radius of curvature of 54.0 cm. What is the absolute size of the image?

## Homework Equations

Maybe these are relevant

Mirror equation in terms of focal length:

[tex]\frac{1}{p}+\frac{1}{q}=\frac{1}{f}[/tex]

Magnification of image:

[tex]M=\frac{h'}{h}=-\frac{q}{p}[/tex]

## The Attempt at a Solution

I have already calculated the distance of the image from the mirror to be 209 cm. But how do I calculate the size of the image? Is there a special formula or do I need to use some kind of trigonometry? I had no luck using the trying the above equations...

The correct answer must be 155.