Physics

Problem

A compound microscope uses an objective of focal length

0.5\,\text{cm}

and an eyepiece of focal length

2.5\,\text{cm}

. The tube length is

16\,\text{cm}

and the final image is at infinity. Calculate the percentage increase in magnifying power if the eyepiece is replaced by another of focal length

2.0\,\text{cm}

, keeping all other parameters unchanged.