Electromagnetic Radioation Optics

[AndrewTT]

A convex mirror has a focal length of 16cm. How far behind the mirror does the image of a person 3.0m away appear?

I've tried using the equation
1/f = 1/do + 1/di

The answer to the solution is -15cm but I'm not sure how to get there. I'm thinking that it might have something that deals with theory to solve this.

 

[Orodruin]

Hi AndrewTT and welcome to PF!

As you can read in our guidelines, you need to provide a little more information on your attempt. For example:

I've tried using the equation
1/f = 1/do + 1/di

What did you get when you tried to use this?