Giant Fresnel Lens

Giant Fresnel Lens

OK, this is just cool:

For those unfamiliar with a Fresnel (fray-nel) lens, it’s a flat surface with a series of concentric circular ridges. Basically, since it’s the outermost part of a lens that does the most focusing, this is like combining hundreds (maybe thousands in this case) of “traditional” lenses.

So what do you do with a giant Fresnel lens? Anyone who ever cooked ants and started paper fires with a magnifying glass knows the answer to that question:

When I carried the lens out of the garage, I knew we were in for a good show. The asphalt driveway started smoking. Our first target was a penny which the lens quickly melted into slag. Next up was a hamburger. We widened the focus and it flash cooked the top of the burger.

I gotta get me one of these. 😉


2 thoughts on “Giant Fresnel Lens

  1. Anonymous says:

    Thank you for linking to my blog. I just started blogging this week and I’m really enjoying the format. I’ll have to post more pictures of the lens in action.


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