A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
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concave mirror farther than one focal length from the burning candle.
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a convex mirror farther than one focal length from the burning candle.
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a biconcave lens farther than one focal length from the burning candle.
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a concave mirror closer than one focal length to the burning candle.
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a convex lens closer than one focal length to the burning candle.