0 cm, and a tube length of 20 cm, the magnification is
m
m m
fL
fD
o
e
o
e
=
=








     
20
25
250
1
2
�
�
�
Various other factors such as illumination of the object, contribute to
the quality and visibility of the image In modern microscopes, multi-
component lenses are used for both the objective and the eyepiece to
improve image quality by minimising various optical aberrations (defects)
in lenses 9 7