Terrestrial Telescope
Category : JEE Main & Advanced
It is used to see far off object on the earth.
(1) It consists of three converging lens : objective, eye lens and erecting lens.
(2) It's final image is virtual, erect and smaller.
(3) Magnification : \[{{m}_{D}}=\frac{{{f}_{0}}}{{{f}_{e}}}\left( 1+\frac{{{f}_{e}}}{D} \right)\] and \[{{m}_{\infty }}=\frac{{{f}_{0}}}{{{f}_{e}}}\]
(4) Length : \[{{L}_{D}}={{f}_{0}}+4f+{{u}_{e}}\] and \[{{L}_{\infty }}={{f}_{0}}+4f+{{f}_{e}}\]
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