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An anatomist is viewing heart muscle cells with a microscope that has two selectable objectives with refracting powers of 100 and 300 diopters. When she uses the 100 diopter objective, the image of a cell subtends an angle of 3 multiplied by 10-3 rad with the eye. What angle is subtended when she uses the 300 diopter objective?

A microscope for viewing blood cells has an objective with a focal length of 0.50 cm and an eyepiece with a focal length of 2.5 cm. The distance between the objective and eyepiece is 14.0 cm. If a blood cell subtends an angle of 2.1 multiplied by 10-5 rad when viewed with the naked eye at a near point of 27.0 cm, what angle (magnitude only) does it subtend when viewed through the microscope?

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