# JEE Main & Advanced Physics Ray Optics Terrestrial Telescope

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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