An object is to be seen through a simple microscope of focal length 12 cm. Where should the object be placed so as to produce maximum angular magnification? The least distance for clear vision is 25 cm.

Answer

A, C

Explanation

For the given simple microscope
f=12 cm and d=25 cm ltbr. For maximum angular magnification the image shoud be perduced at least ditance of clear vision.
v=D=/25cm`
`Now 1/v-1/u=1/f`
`rarr 1/v=1/u+1/f`
`=1/(-25)-1/12`
`=-(25-12)/300=-300/37`
`rarr U=-300/37=-8.1cm`
So the object should be placed at 801 cm away from the lens.