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NEET 2022 Model Paper 1
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© examsnet.com
Question : 29
Total: 200
A compound microscope has lens with objective of focal length
0.5
c
m
and eye piece of focal length 5 and the lenses are separated by
7
c
m
. What is the magnification of microscope when final image is formed at infinity?
12
14
15
18
Validate
Solution:
f
e
=
5
c
m
and
L
=
7
c
m
∴
First image be formed at
=
2
c
m
from
objective
f
e
=
5
c
m
and
L
=
7
c
m
∴
First image be formed at
=
2
c
m
from
objective
∴
v
0
=
+
2
c
m
Also
f
0
=
0.5
c
m
1
v
0
−
1
u
0
=
1
f
0
∴
v
0
=
+
2
c
m
Also
f
0
=
0.5
c
m
1
v
0
−
1
u
0
=
1
f
0
1
u
0
=
1
v
0
−
1
f
0
=
1
2
c
m
−
1
0.5
c
m
u
0
=
−
2
3
c
m
∴
m
=
v
0
u
0
×
D
f
e
=
2
(
−
2
3
)
×
25
5
=
−
15
© examsnet.com
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