JAMB - Physics (2000 - No. 24)
What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?
Compound microscope
Galileo's telescope
Terrestrial telescope
Astronomical telescope
Maelezo
An astronomical telescope traditionally consists of two converging lenses with the objective having a longer focal length than the eyepiece. In this case, the 50 cm lens would serve as the objective, and the 5 cm lens as the eyepiece, which is a standard configuration for astronomical telescopes.