Old 02-04-2008, 10:38 PM #1
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Default Parabolic Mirror

I got a crappy mirror from Walgreens for $6. Its about 5 inches in diameter and has a focal point of about 8 or 9 inches. Its a second surface mirror so it doesn't work too well, you can see the star pattern it makes around the focused beam of sunlight. But it burns like hell. Even with a spot the size of a penny it can smoke wood.

http://s77.photobucket.com/albums/j5...t=MOV04815.flv


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Old 02-04-2008, 11:25 PM #2
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Default Re: Parabolic Mirror

i have a big page sized magnifying sheet, works great for starting fires
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Old 02-04-2008, 11:45 PM #3
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Default Re: Parabolic Mirror

Sweet!

*goes looking for one*
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Old 02-05-2008, 12:15 AM #4
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Default Re: Parabolic Mirror

That is a lot of fun. After I saw this video I snatched my GF's makeup/plucking mirror and burned the crap out of a magazine. ;D
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Old 02-05-2008, 12:28 AM #5
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Default Re: Parabolic Mirror

Quote:
Originally Posted by MarioMaster
i have a big page sized magnifying sheet, works great for starting fires
I've been tempted to buy one of those so many times. ;D
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Old 02-05-2008, 11:57 AM #6
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Default Re: Parabolic Mirror

I have a small one somewhere, since I moved house I haven't seen it yet...
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Old 02-10-2008, 11:06 PM #7
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Default Re: Parabolic Mirror

You can also use a Fresnel lens.
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Old 02-11-2008, 12:54 AM #8
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Default Re: Parabolic Mirror

or take your glasses and put a drop of water on them that works also
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Old 02-11-2008, 02:03 AM #9
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Default Re: Parabolic Mirror

Quote:
Originally Posted by ixfd64
You can also use a Fresnel lens.
that's what the big magnifying sheet is, i can set an entire newspaper on fire in seconds with it =P
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Old 02-11-2008, 02:12 AM #10
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Default Re: Parabolic Mirror

Awww, reminds me of the good ole days of my youth. A sunny day, a magnifying glass, no bug or leaf stood a chance! lol ;D
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Old 02-11-2008, 02:14 AM #11
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Default Re: Parabolic Mirror

In the optics section there's a post with a link to a reallyfuckinbigass fresnel lens...
For $129.
And they have page size ones for $2.
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Old 02-22-2008, 08:44 PM #12
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Default Re: Parabolic Mirror

if you can get your hands on the lense from an old over-head progector they work great especially the big flat lenses that you put the paper on(they work best if you split them, cause they are two lenses glued together) the other lens in the bit at the top also works
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Old 02-24-2008, 06:15 PM #13
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Default Re: Parabolic Mirror

mine evaporates water instantly and burn white matches as well as ink cartridge (transparent). It also burn white paper
Oh it's my moms makeup mirror with 16 cm in diameter. I have two others with 6 cm in diameter but still burns anything (exept stone and metal)
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Old 03-01-2008, 05:24 AM #14
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Default Re: Parabolic Mirror

SWEET! I just remembered I tore apart an old makeup mirror to use for my video projector. I thought about getting rid of the other side!

Thanks! Next project~use sun to burn from 50 feet.
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