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Physics

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A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the image distance?


-21.4 cm

21.4 cm

65 cm

35 cm

  • Physics -

    Review and use the lens equation.
    1/do + 1/di = 1/f

    Candle height does not affect image position. Let x be the image location

    1/50 + 1/x = 1/f = 1/15

    1/x = 10/150 - 3/150 = 7/150
    x = 150/7 = (one of your choices)

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