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AIPMT 2004 Physics and Chemistry Paper
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© examsnet.com
Question : 32
Total: 100
A telescope has an objective lens of
10
cm
diameter and is situated at a distance of one kilometer from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is
5000
Å
, is of the order of-
5
m
5
mm
5
cm
0.5
m
Validate
Solution:
θ
=
d
D
but
θ
=
λ
a
(Note : - exact relation
θ
=
1.22
a
λ
)
d
D
=
λ
a
⇒
d
=
λ
D
a
⇒
d
=
5000
×
10
−
10
×
10
3
10
×
10
−
2
=
5
mm
© examsnet.com
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