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Question
In Ramsden eye piece, the two plano convex lenses each of focal length f and separated by a distance 12 cm. The equivalent focal length(in cm) of the eye piece is
A
10.5
B
12.0
C
13.5
D
15.5
Medium
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Solution
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Correct option is C)
In Ramsden eye-piece,
f
R
=
4
3
×
2
3
L
Thus, for L = 12,
f
R
=
1
3
.
5
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