5.21 A candle flame is 18.0 cm in front of a thin positive lens. Its im-age appears three times farther away from the lens than
5.21 A candle flame is 18.0 cm in front of a thin positive lens. Its im-age appears three times farther away from the lens than if the same candle were on a very distant mountain. Determine the lens's focal length. (2 points)
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