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No. Those particular mirrors have an extremely short focal length with a terrible figure, so they are not capable of focusing the sun to the necessary concentration. And this also does not change the amount of energy coming in from the Sun at THAT time of year and time of day. None of this adds up.
I can't get anything to burn at sunset in the middle of summer here in Sydney with a dirty great big magnifying glass, DELIBERATELY trying to cause burning, and a fire started this way in the UK in spring?????
Think about it.
I'll do a Mythbusters experiment myself about this. I'll get one of these magnifying cosmetic mirrors and try to cause a fire this afternoon (or the very first clear sunset). I'll also use a 114mm diameter astro mirror to do the same, knowing that the figure will be much better than that of a cosmetic mirror. I'll try to get a very dry piece of newspaper to catch fire. This eill be from a warmer Sydney than a cooler UK.
Hmm, I know someone in the UK I could also ask to replicate this experiment too.
Last edited by mental4astro; 23-04-2019 at 10:18 AM.
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