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Posted By: luditewell, I've seen the runners on the london marathon being wrapped in bacofoil. . . . . I've even wrapped someone in it myself. . . . . I use tinfoil on the chicken when I roast it for dinner. . . . . . but you would have to work pretty hard to convince me that I could warm myself up just by looking at the reflection of a fire in a mirror without having the fire itself. . . . . . could I put a picture of a fire on my laptop - which is light after all - and warm myself?
Posted By: luditeI'm not sure about mirrors joe.e They reflect light just fine, but they don't seem to reflect heat - or maybe that's my imagination.
Posted By: AlbertOn the mirrors & IR radiation topic, I used to be involved with military standard thermal imaging. Basically they're TV cameras sensitive to body-temperature infra-red. Glass is opaque to that waveband so the lenses were made from solid germanium.
Using surface-silvered glass would solve the problem. The reason most mirrors have glass on the front is to protect the silvering. An easy alternative would be aluminium foil glued to a substrate. As this could be anything, including wood, it would be easy enough to make decent sized convex mirrors.
Posted By: joe.eEd, do you know how easily the near-IR passes through glass?
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