Which of the following are functions of the eyepiece lens of a refracting telescope?
Check all that apply.

A to produce an image whose angular size is greater than that of the object
B to magnify the image produced by the objective lens
C to reverse the orientation of the image produced by the objective lens
D to form an image at the focal point of the objective lens

What must result if the eyepiece lens of a refracting telescope is replaced with a lens that has a shorter focal length?
Check all that apply.

A The length of the telescope must be reduced.
B The angular magnification produced by the telescope increases.
C The focal length of the objective lens decreases.
D The angular size of the image seen by the viewer increases.