A compound microscope has an objective of focal length and an eyepiece of focal length

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A compound microscope has an objective of focal length

f_{o}=0.40\,\text{cm}

and an eyepiece of focal length

f_{e}=2.5\,\text{cm}

. The distance between the objective’s focal plane and the eyepiece is

L=16\,\text{cm}

. Taking

D=25\,\text{cm}

, calculate the approximate magnifying power

M

when the final image is at infinity. (a) 440 (b) 400 (c) 160 (d) 625