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Re: making a spherical mirror
This may be of no use but I recall seeing instructions on the net of how to start a fire with a coke can, chocolate bar, and a stick. You may want to search this but if I recall correctly, you rub the bottom of the can with the chocolate and it slowly pushes into a parabola. Now it supposedly becomes reflective and able to focus sunlight. I just thought this was interesting and thought that though I do not know how to apply it to your current need, perhaps it will give someone ideas.
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