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Julian, read post No 6.
Ever try to roast ants at 7pm with your magnifying glass? Try it at 5pm here in Sydney during summer.
A cosmetic mirror (103mm diameter) doesn't have the quality of figure for a sufficiently focused image to cause combustion, nor burn my hand at noon when the Sun as the least amount of atmosphere to travel through. The late afternoon Sun in the UK when the fire started in that house certainly won't have the energy.
Remember, the article specifically mentions the fire was controlled by 8pm local time. Say the fire started an hour earlier, the amount of energy in the sunlight is what is in question. This is very different from noon.
Last edited by mental4astro; 23-04-2019 at 01:46 PM.
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