The linear magnification m, for the image formed at the near point D,
by a simple microscope can be obtained by using the relation
FIGURE 9 23  A simple microscope; (a) the magnifying lens is located
such that the image is at the near point,  (b) the angle subtanded by the
object, is the same as that at the near point, and  (c) the object near the
focal point of the lens; the image is far off but closer than infinity Rationalised 2023-24
Physics
242
m
uv
v v
f
fv
=
=



 = 



1
1
1
–
–
Now according to our sign convention, v is negative, and is equal in
magnitude to D Thus, the magnification is
m
fD
=
+

1
(9