ATS you are giving the formula for the area of a circle but that has nothing to do about its magnification, which is what focuses the sun rays to a focal point for ignition.
you could have a 3 inch...
Type: Posts; User: Michael aka Mac
ATS you are giving the formula for the area of a circle but that has nothing to do about its magnification, which is what focuses the sun rays to a focal point for ignition.
you could have a 3 inch...