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  4. The length of an astronomical telescope for normal vision (relaxed eye) will be

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Q. The length of an astronomical telescope for normal vision (relaxed eye) will be

AMUAMU 2004

Solution:

To see with relaxed eye, final image is formed at infinity. For this, the distance between the objective $O$ and eyepiece $E$ is so adjusted such that the image of distant objective formed by the objective falls at the focus of the eyepiece. This will be so, when $L=f_{o}+f_{e}$ where $L$ is length of telescope.

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