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
q
L
p
=
−
=
−
=
(
)(
)
1
1
1
28.1 cm
1.622 cm
1.72 c
28.1 cm
1.622 cm
o
o
q f
p
q
f
=
=
=
−
−
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
M
M
16.3
31.5
514
−
+
= −
e
M
=
=
The lateral size of the final image is
(
)
(
)
3
2
10
cm
−
−
×
29.0 cm
1.43
10
rad
4
e
e
h
q
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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 Spring '09
 Physics, Work, 0.920 cm, 1.09 cm, 1.72 cm

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