You are provided with two convex lenses having focal lengths 4cm and 80cm, respectively, to form an astronomical telescope.
Calculate its magnifying power for normal adjustment.

How are power and focal length of a lens related ? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light ?

Explain the construction and working of an astronomical telescope. Calculate its magnifying power when the image is formed at the least distance of distinct vision.

If F_(0) and F_(e) are the focal lengths of the objective and eye-piece respectively for a Galilean telescope, its magnifying power is about

A telescope has an objective of focal length 100 cm and an eye-piece of focal length 5 cm. What is the magnifying power of the telescope when it is in normal adjustment?

Two plano-convex lenses of focal lengths 20cm and 30cm are placed together to form a double convex lens. The final focal length will be

An astronomical telescope consists of two thin convex lenses having focal lengths of 140 cm and 5 cm. The telescope is adjusted to be in normal adjustment. What is the angular magnification, i.e.. magnifying power of the telescope in this set up? (ii) What is the distance between the two lenses equal to ?

The focal length of the eyepiece and the objective of an astronomical telescope are 2cm and 100cm respectively. Find the magnifying power of the telescope for normal adjustment and the length of the telescope.

A convex lens of focal length 10 cm and imag formed by it, is at least distance of distinct vision then the magnifying power is

If f_o and f_e are the focal lengths of the objective lens and eye-piece lens respectively for a telescope, the length of telescope in normal adjustment is

The optical length of an astronomical telescope with magnifying power of 10, for normal vision is 44cm. What is focal length of the objective?