A compound microscope consists of an objective lens of focal length 2.0 cm and an eye piece of focal length 5 cm separated by a distance of 15 cm. How far from the objective lens should an object be placed in order to obtain the final image at infinity? (a) 2.5 cm (c) 4.2 cm (b) 3.8 cm (d) 6 cm
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(d) 6 cm is the answer of this question .
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