Some boys are trapped on a desert island because of a plane crash. They are from a military school. There is a pilot with them, the father of one of the boys but he is in both a menatlly and physically unstable condition. He dies, and the boys have to survive by hunting for meat and killing pigs. Eventually they are split into 2 tribes, Jack's tribe and Ralph's tribe. Ralph has been elected chief of the island but most boys are in Jack (the lead hunter)'s tribe. Jack's tribe kill Piggy (the last remaining member of Ralph's tribe) and Ralph is alone. There is a big chase scene during which the boys set fire to the island. Ralph runs out into a clearing to discover a troupe of soldiers who saw the fire and have come to rescue them.
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?Rob Halliday
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