Recycling Overhead Projector lens for Solar Oven/furnace

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The standard fresnel lens in an overhead projector would seem to be ideal for a high temperature solar oven, but it doesn't focus the suns parallel rays very well. If you split it, you get 2 lenses that work very well.

Be careful! high temperatures are reached fast! You or kids could get burned or start a fire. Keep the lens in a light stopping bag or other container when not in use. The focal point is VERY bright. Protect your eyes.

That in mind, have some safe fun!
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