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Physics - Please help

  1. Jan 17, 2010 #1
    For real images in converging lenses, I know that if the object distance increases, then the image distance will decrease. However, I need to explain WHY and I don't know? Pleaes help
  2. jcsd
  3. Jan 18, 2010 #2


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    For a given converging lens focal length is constant. The formula for lens is
    1/f = 1/u + 1/v,
    As u increases, v decreases to keep 1/f constant.
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