Optical telescopes tend to have a magnifying lens located where within the body of the telescope?

A. near the eye piece

B. in the middle of the tube

C. the large opening at the opposite end of the eye piece

D. both ends

"The large opening at the opposite end of the eye piece" is the one among the following where optical telescopes tend to have a magnifying lens located within the body of the telescope. The correct option among all the options given in the question is the third option or option "C".