Human Eye

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GALILEAN TELESCOPE OR TERRESTRIAL TELESCOPE


       A Galilean Telescope or a terrestrial telescope is an optical instrument which is used to see the magnified image of distant objects on earth. Galilean telescope consists of a convex lens as objective lens but a concave lens as eye piece. It always forms erect images of the objects seen through it.

A Galilean Telescope or a terrestrial telescope


Differences between Astronomical Telescope and Galilean Telescope

S No. Astronomical Telescope Galilean Telescope
1. An astronomical telescope is an optical instrument which is used to see the magnified image of distant heavenly bodies like stars, planets, satellites and galaxies etc. A Galilean Telescope or a terrestrial telescope is an optical instrument which is used to see the magnified image of distant objects on earth.
2. It consists of two convex lenses. It consists of a convex objective lens and concave eye piece.
3. The final image formed by astronomical telescope is always inverted. The final image formed by Galilean telescope is erect.
4. Its magnifying power is high. Its magnifying power is low.



Test Your Understanding and Answer These Questions:




  1. Which instrument is used to see distant objects?

  2. Why Galilean telescope is not used to seen heavenly bodies?

  3. Give differences between astronomical and Galilean telescope.