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  4. How powerful a lens would a magnifying glass need to have to burn metal 9cm away?
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How powerful a lens would a magnifying glass need to have to burn metal 9cm away?

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Offline thedoc (OP)

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How powerful a lens would a magnifying glass need to have to burn metal 9cm away?
« on: 04/12/2016 08:23:01 »
denken asked the Naked Scientists:
   What magnifying glass of what power must we use to burn a metal in a distance of 9cm?
What do you think?
« Last Edit: 04/12/2016 08:23:01 by _system »
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Offline RD

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Re: How powerful a lens would a magnifying glass need to have to burn metal 9cm away?
« Reply #1 on: 04/12/2016 10:10:32 »
If you use a metal with a low melting point then a regular magnifying glass would suffice ...

https://www.youtube.com/watch?v=WS1gOYGS41M[url]
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