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

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

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

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

The length of the tube of an astronomical telescope is 80 cm and the magnifying power of the instrument is 19 . Calculate the focal lengths of the objective and the eyepiece.