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Old Nov 7th 2009, 12:49 AM   #1
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combining lenses



I worked this problem and found some strange answers: 2 thin lenses separated by 10cm. First has a focal length of 20cm, the second has a focal length of 30cm. Here are my answers:




Where H denotes the principle planes and O denotes the lenses.
So here's the problem, recall that the lenses are separated by only 10cm, this forces principle plane #2 to be in front (left of) principle plane #1. How can this be true? What did i do wrong?
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Old Nov 8th 2009, 10:02 PM   #2
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Well i cant see any answers. Maybe i need fresh lenses
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