Question

The magnification of a telescope with an objective lens focal length of 80 cm and an eyepiece focal length of 4.0 cm is:

a) 20
b) 200
c) 16
d) 320

Answer 1

The magnification of the telescope is 20.

Step-by-step explanation:

The magnification of a telescope is determined by the ratio of the focal length of the objective lens to the focal length of the eyepiece. In this case, the objective lens has a focal length of 80 cm and the eyepiece has a focal length of 4.0 cm. Therefore, the magnification is calculated by dividing the focal length of the objective lens by the focal length of the eyepiece: magnification = objective lens focal length / eyepiece focal length = 80 cm / 4.0 cm = 20. The correct answer is a) 20.