I'm looking for a mirror for the "touch the spring" project. I can't
find one that's as big as 40 cm. I checked all of the links that you
have for materials. The largest is 10 cm. I did find a large parabolic
mirror, but I think that when you say concave mirror you mean a
spherical concave mirror. Is that correct? Am I looking for a
spherical mirror? Actually looking in the book, I see a reference to
both spherical and parabolic mirrors. Will both work?
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