Convex mirror

1. Jan 27, 2010

luysion

Hey,
When dealing with convex mirrors I know that the image will always be virtual,upright and diminished. So when im using descartes's formulae i know that for convex mirrors that the focal length is negative, but does my 1/di become negative? because virtual images have a negative height and distance.

Cheers

2. Jan 28, 2010

Staff: Mentor

Yes, the image distance is negative for a convex mirror. (This follows directly from the spherical mirror equation.)