I posted earlier asking if my science fair idea—to use many mirrors to reflect light onto one point—would work. After getting a reply that it would, I now have another question. It's clear that I have to use a curved board to mount the mirrors onto, or I would just get reflection of straight light ray parallel to each other. Kinda useless. How can I find the equation for the curvature of my board? Honestly, I don't know when to start here... if it makes a difference I plan to use between 300 and 500 mirrors of 3/4 in squared to an 1inch squared area each. All help appreciated!