For a simple microscope, when the final image is formed at the least distance of distinct vision $D$, the magnifying power is
A$m=\dfrac{D}{f}$
B$m=1+\dfrac{D}{f}$
C$m=\dfrac{f}{D}$
D$m=1+\dfrac{f}{D}$
Answer & Solution
Correct answer: B. $m=1+\dfrac{D}{f}$
For a simple microscope with the final image at the least distance of distinct vision, the magnifying power is $m=1+(D/f)$. The form $m=D/f$ applies when the final image is at infinity.
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