WAEC - Physics (1992 - No. 29)
When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses?
20.0cm
47.5cm
50.0cm
52.5cm
125.0cm.
Пояснення
Distance between lens = f0 + fe = 52.5cm