The collecting lens gives a direct image of the object

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Uploaded: 18.04.2016
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Description

The collecting lens gives a direct image of the object with increasing k2. The distance between the object and the image of 20 cm. Find the focal length of the lens.

Additional information

Task 40839. The solution formulas and the laws of recording used in the decision, drawing, calculation formula and the withdrawal response.
If you have any questions about the decision to write. I try to help.

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