A conceptual question for optics-please help.

[pyroknife]

I was wondering if for real images, do the objects and image always end up on the same side of a mirror/lens?

 

[sandy.bridge]

If I am understanding your question properly, then no they do not have to exist on the same side. A convex lens will form a real image on the opposite side of the lens, relative to the object.

 

[pyroknife]

Ah what's your mnemonic device for remembering these? I found this on wiki http://en.wikipedia.org/wiki/Curved_mirror, but I can't memorize all that.