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I'm looking for a Fresnel lens to use in my science classroom. Ultimate goal is to be able to melt rock and bring a little pazaz into my Earth science class. I know the old projection screen tv's all have fresnel lens in them BUT I need whats called a spot lens. Only certain models have these.

Question: Anyone who has obtained a frenel lens from a projection tv. Can you help me narrow down the makes and models that contain or don't contain spot lens.

I know its a long shot. Thanks
 
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