A compound microscope has an eyepiece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective, so that final image is formed at the least distance of distinct vision 20 cm.

A compound microscope has an eyepiece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective, so that final image is formed at the least distance of distinct vision 20 cm.

1 Answer

127 votes

The following ray diagram shows the formation of image by a compound microscope.

Given, = 10 cm, = 4 cm, = -5 cm, = 20 cm

For objective lens

Magnification

127 votes

127