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KEAM 2010 Physics and Chemistry Paper
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© examsnet.com
Question : 17
Total: 119
An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and the eye-piece is
36
c
m
and the final image is formed at infinity. The focal length
f
0
of the objective and
f
e
of the eye-piece are respectively
45
c
m
and
9
c
m
50
c
m
and
10
c
m
7.2
c
m
and
5
c
m
30
c
m
and
6
c
m
5
c
m
and
7.2
c
m
Validate
Solution:
f
o
f
e
=
5
or
f
o
=
5
f
e
f
0
+
f
e
=
36
5
f
e
+
f
e
=
36
f
e
=
6
c
m
and
f
0
=
30
cm
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