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A compound microsope of an objective le...

A compound microsope of an objective lens of focal `2.0cm` and an eye-piece of focal length `6.25cm` separeated by a distance of `15cm`. How far form the objective shold an object be placed in order to obtain the final image at (a) least distance of disnict vision `(25 cm)`, (b) infinity? What is the magnifying power of the microscope in each case?

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