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A compound microscope has an objective o...

A compound microscope has an objective of focal length `2 cm` and an eye-piece of focal length `3 cm`. An object is placed at a distance of `2.4cm` in front of the field lens. Find the magnifying power of the instrument and length of the tube is (a) final image is at infinity and (b) final image is at least distance of distinct vision.

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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 magnifying power of compound microscope if final image is formed at the near point. Also, calculate length of the tube of compound microscope.