Subject: Making the sun's rays parallel

I've found that many times, when talking about the sun's rays, they're referred to as 
almost parallel. Obviously, this isn't the case; the sun is a disc, not a point source of 
light. Here's my question: if I were trying to take the reflection off of a circular mirror that 
was, say 1 foot in diameter, what could I do to make those light rays parallel? Would a 
slightly convex mirror do the trick? Image quality is not the issue. What about a lens? 
Thanks in advance.

Daniel

Re: Making the sun's rays parallel