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

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2.5

3.5

2.0

3.0

answer is A.

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Detailed Solution

P = Power of combination =P1+P2=+20 + −10=+10D∴ F=1P=110m=10cm.For normal vision m=DF=2510=2.5

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