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  4. In Ramsden eyepiece the focal length of each lens is F. The distance of the image formed by the objective lens from the eye lens is

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Q. In Ramsden eyepiece the focal length of each lens is F. The distance of the image formed by the objective lens from the eye lens is

EAMCETEAMCET 2007

Solution:

The distance of image formed by the objective lens from the eye lens $ =\frac{2F}{3}+\frac{F}{4} $ $ =\frac{8F+3F}{12}=\frac{11F}{12} $