Telescope parts and functions. Some help needed.

Question

Here are the choices used to fill in the black. I cannot find the information online that shows what each function is.

FYI- The spider is the four arms( that hold a part together)

Match the correct letter with each fill in the blank (1-4) below.

A. counterweight

B. primary mirror 2.

C. eyepiece

D. Spider 3.

E. Primary Lens

F. Secondary Mirror

1. Collects light in a refracting telescope._____

2. Determines the diffraction limit of a refracting telescope____

3. Directs light toward the observer in a reflecting telescope____

4. Collect light in a reflecting telescope____

Answer 1

1. A refractor uses just lenses so it could be the primary lens. But the primary lens refracts light towards the eyepiece, so in either case, lens or eyepiece could be said to collect the light of a refractor.

2. The primary lens of a refractor determines the diffraction limit (or resolution) of the telescope.

3. The secondary (or diagonal) mirror directs light towards the observer (via the eyepiece).

4. The primary mirror collects the light in a reflector.