Solar cookers?

Question

what are some easy ways to make a solar cooker for a science project? it needs to be relatively easy and actually able to bake something. i can't use a magnifying glass.

Answer 1

make a parabolic reflector out of aluminum foil and put the hot dog at the focus.

Parabolic reflectors are difficult, but a hemisphere is a good approximation. Imagine a sphere and chop off 1/3 of it. Form a piece of Al foil to this shape. Use a bowl or a beach ball as something to form the Al foil on.

Use heavy foil or use 3 or 4 layers so it holds it's shape.

Put it in the sun, pointing towards the sun, and put a marshmallow at the focal point, which you can find by trial and error. If you formed it from a beach ball, think of where the center of the beach ball is, that would be the focus.