Question

# A compound microscope having $$f_{0}$$= 7mm, $$f_{e}$$= 20 mm and distance between the lenses is 20 cm. If image is formed at least distance of distinct vision then magnifying power ?

A
388
B
400
C
220
D
120

Solution

## The correct option is A 388In case image is formed at infinity, the magnification provided by thecompounds microscope is,$$M= \dfrac{L}{fo}(1+\dfrac{D}{fe})$$L = Length of tube = 20 cm.D = Distance of near vision = 25 cmso, $$M= \dfrac{20}{0.7}(1+\dfrac{25}{2})\simeq 385.7$$Physics

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