Q. If the focal length of the objective of a compound microscope is 1cm, the focal length of of the eyepiece is 2cm and length of tube 20 cm, then find the magnification of this instrument when the final image is formed at infinity.
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Answer:
Explanation:
Given f
e
=3cm and
f
o
=1.2cm
u
o
=1.25cm
v
e
=∞
From ,
u
o
1
+
v
o
1
=
f
o
1
,
we get
v
o
1
=
1.2
1
−
1.25
1
v
o
=30 cm
Magnification of microscope m=
u
o
v
o
(
f
e
D
)
m=
1.25
30
(
3
25
)=200
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