The subject is at a distance L = 0.9 m from the screen.

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Description

The subject is at a distance L = 0.9 m from the screen. Between the subject and the screen moves the lens, with a lens at one position on the screen is an enlarged image of the object, while the other - reduced. Is the focal length F of the lens, if the linear dimensions of the first image to k = 4 times larger than the second?

Additional information

Task 40503. Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
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