question_answer

A converging lens of focal length\[f\]is used as simple microscope. If the least distance of  district vision 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)         \[D/f\]

E)  \[\frac{f}{D}+1\]