An opera glass `(`Galilean telescope ) measures `9cm` from the objective to the eyepiece. The focal length of the objective is `15 cm`. Its magnifying power is

A Galilean telescope measures 9 cm from the objective to the eyepiece. The focal length of the objective is 15 cm. Its magnifying power is A

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 -

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

The magnifying power of an astronomical telescope for normal vision is 10 . The focal length of the objective is 20 cm . What will be the magnifying power for focussing the final image formed at a distance of 25 cm from the eyepiece ?

A Galilean telescope has objective and eyepiece of focal lengths 200 cm and 2cm respectively. The magnifying power of the telescope for normal vision is