Question

A 4-inch, f/5 telescope has a 1-inch eyepiece focal. Its magnifying power is:
4X
5X
9x
20x

Answer 1

Its magnifying power is: 4X 5X 9X 20X. A 4-inch, f/5 telescope has a 1-inch eyepiece focal. Its magnifying power is 9x. This answer has been confirmed as correct and helpful.

Answer 2

20x

explanation? I dont need to give one