Playing with a 13" Fresnel lens
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Uploaded by thecheatscalc on Jan 3, 2008
Here's a 13 inch fresnel lens I bought off anchoroptics.com for $8 instantly torches wood... melts pennies... ect. Quite fun the play with!
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@pvmblr 1) Too many question marks, dude.
2) Unlikely. A laser's beam can be focussed into a narrow beam because lasers function as point sources. The sun is not a point source, it has an apparent area in the sky. This means the beam will always spread out, no matter what your focussing arrangements, unless you pass the light through a tiny pinhole; this, if I remember my physics correctly, should act as a point source and allow you to collimate into a beam, but it would be really weak.
93tomb 10 months ago
can you use a prism and direct this heat that is being generated??? Something like a laser???
Has anyone tried this????
pvmblr 1 year ago
pennies from 1981 and older are made of copper. newer ones are zinc electroplated in copper.
mdonato7 2 years ago
is that lens circular or rectangular?
andypandy687 2 years ago
how much is shipping
megamaniac1 2 years ago
Not since 1982, I think that was the last year, now they are mostly zinc with a copper coating.
Lancewar1 3 years ago 2
Unless I'm not mistaken, pennies are made of copper.
LRMNmeyer 3 years ago
I don't need a soldering iron I just need a fresnel lens and some dr.pepper
(419.53 °C) 787.15 °F is the temperature zinc melts, pennies are mostly made up of it.
awesomeflame 3 years ago
Get this link from LC cheat... Now ive ordered one... encouraging me to waste money :D
Chickenfish
chickenfish1234 3 years ago
which one was it.... desk top magnifyer hand held which one??
LaserfanDan 3 years ago