Playing with a 13" Fresnel lens

[pvmblr]

can you use a prism and direct this heat that is being generated??? Something like a laser???

Has anyone tried this????

[93tomb]

@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.

[andypandy687]

is that lens circular or rectangular?

[megamaniac1]

how much is shipping

[awesomeflame]

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.

[LRMNmeyer]

Unless I'm not mistaken, pennies are made of copper.

[Lancewar1]

Not since 1982, I think that was the last year, now they are mostly zinc with a copper coating.

[mdonato7]

pennies from 1981 and older are made of copper. newer ones are zinc electroplated in copper.

[chickenfish1234]

Get this link from LC cheat... Now ive ordered one... encouraging me to waste money :D

Chickenfish

[LaserfanDan]

which one was it.... desk top magnifyer hand held which one??

[bgineat]

I just took a 3 foot square one out of a junk tv where I live yeaaaah I saw a post they are found in large screen tvs. 1200 watts supposedly the guy stated look forward to using it.

[kasjv]

u want to sell it ?

[Herthan]

watch out dude your gonna melt your hand

[YairGeva7]

OMG! IT melted the ROCK! holy SHIT!

$8?!!? i'm buying one right now!