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Old 01-31-2008, 03:35 PM #17
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Default Re: Question about the sun and magnifying glasses

Wikipedia gives the solar constant at 1,370 W/m[sup]2[/sup] at it's zenith. The earth's atmosphere absorbs some of the energy lowing the value to ~1kW at ground level. Now you need to factor in that the glass transmits only ~90% of visible light. and as for invisible light... you never know. You'll probably only end up with 700W MAX. Even then, that's white light, and nothing but black with absorb most of it. It's a pretty neat idea, but a piece of glass that big and precise may cost it's weight in silver. Fresnel lenses twice that size can be found on ebay for $100 or less.

Quote:
Originally Posted by darklandz
i remeber literally setting some tissue on fire with the sun/magnifying glass trick - yet even a >400mw green laser wont put a single scratch on a white tissue?
That's partially because of the sheer power, and partially as a result of the invisible wavelengths.

Quote:
Originally Posted by likewhat
A microwave oven takes like 2 or 3 minutes to boil a cup of water and it is 1 kW.
Keep in mind that's power consumption, not power output. Only lasers are rated by power output, all other EM devices (that I'm aware of) are rated on input.


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Old 01-31-2008, 04:57 PM #18
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Default Re: Question about the sun and magnifying glasses

Yeah, it might be rated on input, but magnetrons are really efficient unlike lasers so it is still about 1 kW
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Old 02-02-2008, 12:10 PM #19
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Default Re: Question about the sun and magnifying glasses

Magnetrons are about 65% efficient. You'd be like WL if you said 650W is ABOUT 1kW
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Old 02-02-2008, 01:33 PM #20
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Default Re: Question about the sun and magnifying glasses

Quote:
Originally Posted by Ref
It looks like theres a problem with their website at the time of me posting this, but this might be what you're looking for, as well.

http://www.instructables.com/id/Gian...iment-in-Opti/
Oh nice! I see someone already did what I was thinking of.Wow, melting pennies That lens is an ant nightmare!! Too bad he couldn't get it collimated.....
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Old 02-02-2008, 03:30 PM #21
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Default Re: Question about the sun and magnifying glasses

Quote:
Originally Posted by Cyparagon
Magnetrons are about 65% efficient. You'd be like WL if you said 650W is ABOUT 1kW
LOL, trudat
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Old 02-10-2008, 05:14 AM #22
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Default Re: Question about the sun and magnifying glasses

there was a mythbusters not to long agow when they tried to use sevelral concave mirrors to set a wooden ship on fire, but they failed
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Old 02-10-2008, 04:17 PM #23
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Default Re: Question about the sun and magnifying glasses

The largest fresnel lens I have a source for is at the below link. *When you guys start transmuting elements or something cool like that, PM me! *LOL *-Glenn
Put "fresnel" in the search que upper right corner.
http://www.sciplus.com/search.cfm
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