Concave mirror producing an image 3 times larger than the object

[rhxoehwhfh]

A concave mirror has a radius of curvature of 0.5 m. At what position should and object be placed to produce an upright virtual image that is 3.0 times as large as the object?
I have just no clue for this question,, but I have to understand it T.T
can any1 help me please>..

 

[rhxoehwhfh]

any one ? please.. T.T

 

[cristo]

That's rather impatient, waiting only 5 minutes! And you haven't even shown us any work!

What sort of thing have you done in class? Have you done any questions like this, or are there any examples in your book, or class notes on this? You need to show some work before we can help you.

Oh, and what does T.T mean?