It's not a magnifier, it's a reducer, or a negative magnifier if you
prefer. But, since it's reducing the size of the image, it's
concentrating the light into a smaller space. It would be a good fire
starter.
A normal magnifying glass is magnifying the image rather than reducing
it but the sun's image is so small from a lens with, say, a 6" (150mm)
focal length that the hot spot is still very small.
Chuck Norcutt
On 8/31/2014 11:55 AM, Mike Lazzari wrote:
Maybe think of it as a weak magnifier (glass). Am I right?
Yes. As a weak magnifier used to start fires :)
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