Question

A converging lens of focal length $f$ is used as simple microscope. If the least distance of distinct version of the observer is $D$ and the lens is held close to the eye, the magnifying power of the lens is

• A. $D/2f$
• B. $f/D$
• C. $\frac{D}{f}-1$
• D. $D/f$

Answer 1

Answer: (D)

$D/f$

The magnifying power(M) of the lens is given by,

$M=\frac{leastdistanceofdistinctversion}{focallengthoflens}$

Therefore, as per given problem,

$M=\frac{D}{f}$

Hence, option D is correct.