A simple magnifier of focal length and a compound microscope (tube length ) having an…

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

Problem

A simple magnifier of focal length

5\,\text{cm}

and a compound microscope (tube length

20\,\text{cm}

) having an objective of focal length

1\,\text{cm}

and an eyepiece of focal length

5\,\text{cm}

are both adjusted so that their final images are at infinity. Taking the least distance of distinct vision

D=25\,\text{cm}

, what is the ratio of the magnifying power of the compound microscope to that of the simple magnifier? (a)

16.7

(b)

24

(c)

20

(d)

25