How does a refracting telescope work?
It uses two concave lenses to gather and focus light.
It uses a concave lens and a convex lens to gather and focus light.
It uses two convex lenses to gather and focus light.
It uses a concave lens, a convex lens, and a concave mirror to gather and focus light.
Answers
Refracting telescope work by using two lens to focus the light and make it look the object is closer to you than it really

Two converging lenses, an objective and an eyepiece, make a refacting or Keplerian telescope. Schematic at right.
In a telescope, the objective lens should have a long focal length: it is the large lens at left in the photo. A shorter focal length converging lens is at right. (Looking into the objective lens in this side view photo, we see an inverted, diminished, virtual image of the woman passing by. We also see an inverted virtual image in the eyepiece lens in the photo.) To simplify things, we have no tube to shade the lenses.
The schematic at right shows a ray diagram. We put the lens separation equal to the sum of the focal lengths. This means that the image of a very distant object produced by the objective is at the focus of both lenses. This means that the virtual image created by the eyepiece is also very distant, and so can be viewed by a relaxed eye.