The focal length of eyepiece of an astronomical telescope is 6 cm. What is the distance between the objective and the eyepiece if it produces a magnification of 10, for normal adjustment ?

The focal lengths f_(o) and f_(e) of an astronomical telescope at 30 cm and 6 cm respectively. What is the distance between its objective and eyepiece when set for normal adjustment ?

The focal lengths of the objective and eyepiece of an astronomical telescope are 50 cm and 5 cn respectively. Find the tube length and the magnification for parallel vision.

The magnifying power an astronomical telescope in the normal adjustment position is 100. The distance between the objective and the eyepiece is 101 cm. calculate the focal length of the objective and the eyepiece.