# Homework Help: Mirrors/Radius of curvature

1. Sep 17, 2006

### Huskies213

Can anyone explain what i am doing wrong?
I thought the radius of curvature is 2 x the distance from mirror..

A mirror produces an image magnified by 1.5 when your face is 29 cm from the mirror. What is the radius of curvature?

I thought it would be .29m x 2 = .58m... but that is wrong.. can anyone help?!?

Last edited: Sep 18, 2006
2. Sep 17, 2006

### Staff: Mentor

The radius of curvature of a mirror is a statement about the shape of the mirror. Does a mirror change shape when you move to different distances from it?

3. Sep 17, 2006

### Huskies213

RE mirrors

no the mirror doesn't change shape when you move distances from it. the image does... *more hints ...im still lost...

4. Sep 18, 2006

### Claude Bile

You need to work out the Radius of Curvature from the magnification.

Also, Radius of Curvature = 2 x the focal length (f) - so if you can figure out f, then you can figure out the radius of curvature quite easily.

Claude.