A compound microscope uses an objective lens of focal length 4 cm
and eye lens of focal length 10 cm. An object is placed at 6 cm from
the objective lens. Calculate the length of the compound microscope.
(A) 19.14 cm
(B) 19.18 cm
(C) 19.20 cm
(D) 19.25 cm
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a correct answer is (A) 19.14 cm
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