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AP EAMCET Engineering 2012 Solved Paper
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© examsnet.com
Question : 3
Total: 160
The objective and eyepiece of an astronomical telescope are double convex lenses with refractive index
1.5
.
When the telescope is adjusted to infinity, the separation between the two lenses is
16
c
m
. If the space between the lenses is now filled with water and again telescope is adjusted for infinity, then the present separation between the lenses is
8
c
m
16
c
m
24
c
m
32
c
m
Validate
Solution:
From the lens maker formula
µ
3
v
−
µ
1
u
=
µ
2
−
µ
1
R
1
+
µ
3
−
µ
2
R
2
4
3
f
o
′
−
1
∞
=
1.5
−
1
R
+
4
3
−
1.5
−
R
Now, length
=
f
o
′
+
f
e
′
=
2
f
o
+
2
f
e
=
2
(
f
o
+
f
e
)
=
2
(
L
)
=
2
(
16
)
=
32
c
m
© examsnet.com
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