First slide

The optical instruments

Question

The magnifying power of a compound microscope increases when

Moderate

A

The focal length of objective lens is increased and that of eye lens is decreased
B

The focal length of eye lens is increased and that of objective lens is decreased
C

Focal lengths of both objective and eye-piece are increased
D

Focal lengths of both objective and eye-piece are decreased

Solution

$m \propto \frac{1}{f_{o} f_{e}}$

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