A simple microscope consists of a concave lens of power $$-10\ D$$ and a convex lens of power $$+20\ D$$ in contact. If the image formed at infinity, then the magnifying power $$(D=25\ cm)$$ is:

$$2.0$$

$$2.5$$

$$3.5$$

$$3.0$$

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Correct option is A. $$2.5$$

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