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This video demonstrates how a small fresnel lens can be used to start a fire!
Giant Fresnel Lens Deathray: An Experiment in Opticsby DrSimons
Portable Solar Versatilityby IngenuityAtWork
Cooking at 350ºF with the sun (Fresnel cooker from scrap)by alphydan
Portable Fresnel Solar Ovenby Renard_Bleu
Cheap EDC Fire Kit for Survivalby Didimau1
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