Question: One of the boys, called Piggy, wears glasses. Piggy's glasses become an important, prized object, because the boys can use the lenses to refract the sun's rays, and thus start fires. It is fairly well established, that, on a hot day, in bright sunshine, one can focus the sun's rays through a magnifying glass to set light to combustible material. (I've done it myself, although it took me rather longer than the book or film suggested, and it only made a very small flame.) But could you use spectacles, that people wear to correct defective vision, to start a fire in this way? Surely, if this was possible, wouldn't it mean that when people who wear glasses went out in hot sunny weather, then they would burn their eyes?
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