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Optical Instruments
349
The image distance for the objective lens is then
and the object distance for this lens is
1
29.0 cm
0.920 cm
28.1 cm
e
qLp
=− =
−
=
()
( )
1
1
1
28.1 cm
1.622 cm
1.72 c
28.1 cm
1.622 cm
o
o
qf
p
==
=
−−
m
The magnification by the objective lens is given by
1
1
1
28.1 cm
16.3
1.72 cm
q
M
p
=−
and the overall lateral magnification is
( )( )
1
MM
16.3
31.5
514
−+
=
−
e
M
The lateral size of the final image is
( )
32
10
cm
×
29.0 cm
1.43
10
rad
4
ee
hq
θ
′
=⋅
=
×
=
.15
and the size of the red blood cell serving as the original object is
4
7
1
4.15
10
m
8.06
10
m
0.806
514
e
h
h
M
−
−
′
×
=×
=
m
µ
25.25
Some of the approximations made in the textbook while deriving the overall
magnification of a compound microscope are not valid in this case. Therefore, we start
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This document was uploaded on 10/20/2011.
 Spring '09
 Physics, Work

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