### Obtain the focal length of the objective

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The maximum angular magnification of a magnifying glass is 12.0 when a person uses it who has a near point that is 25.0 cm from his eyes. The same person finds that a microscope, using this magnifying glass as the eyepiece, has an angular magnification of -525. The separation between the eyepiece and the objective of the microscope is 23.0 cm. Obtain the focal length of the objective.

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