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Question

If the effective focal length of Huygen’s eye piece is fH, then the length of eye piece is :
  1. 3fH4
  2. 4fH3
  3. 2fH3
  4. 3fH2

A
3fH2
B
3fH4
C
4fH3
D
2fH3
Solution
Verified by Toppr

Two lenses of Huygen's eyepiece are of focal length f and 3f.
Then, effective focal length of Huygens eyepiece =fH =3f2
Length of eyepiece =2f=2×2fh3=4fH3

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