Terrestrial telescope is used to view objects ___________ .

The focal lengths of the objective and the eye-piece of an astronomical telescope are 0.25 m and 0.02m, respectively. The telescope is adjusted to view an object at a distance of 1.5 m from the objective, the final image being 0.25 m from the eye of the observer. Calculate the length of the telescope and the magnification produced by it.

A telescope using an eye piece of focal length 3 cm has a magnification 10 in normal adjustment. If the telescope is now used to view an object placed at a distance of 180 cm from the objective, the new length of the telescope is (assume final image is at infinity).

A telescope using an eye piece of focal length 2 cm has a magnification 20 in normal adjustment. If the telescope is now used to view an object placed at a distance of 2 m from the objective, the new length of the telescope is (assume final image is at infinity).

A telescope using an eye piece of focal length 3 cm has a magnification 10 in normal adjustment. If the telescope is now used to view an object placed at a distance of 180 cm from the objective, the new length of the telescope is (assume final image is at infinity).

Assertion : Astronomical telescope is used to view heavenly bodies. Reason : Telescope is easily protable.

The _____ telescope is used to observe distant objects on the earth's surface.