An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm . The focal length of objective is

An astronomical telescope has a magnifying power 10. The focal length of the eye piece is 20 cm. the focal length of the objective is -

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

An astronomical telescope of magnifying power 12, has an objective of focal length 1.08 m. The focal length of its eyepiece will be

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

If the tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, then the focal length of the objective is .......... cm.