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Shop Fresnel lens
10 Fresnel Lens -- Solar Oven + DIY Projection TV
$17.49
Amazon.com
8.3" x 11.75" LARGE 3X Fresnel Lens FULL PAGE Magnifier -- Solar Oven/DIY Projection TV PLANS (1 pack PREMIUM GRADE Large Lens)
$7.99
Amazon.com
2-Pack Large Fresnel Lenses Φ300mm(11.81") Focal Length 360mm Acrylic Magnifier for Solar Heating,Solar Cooking,Visual Education. (Focal Length
$68.90
Amazon.com
Fresnel Lens Magnifier, 200x200mm, Focal Length 210mm, Acrylic Lens (not Glass), for Physics Classroom,Solar Heating,Magnifiying,Fire Starter.
$23.99
Amazon.com
Fresnel lens
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A Fresnel lens is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
Wikipedia