In an internal focusing telescope
A)the objective is at a fixed distance from the diaphragm
B)the focusing is done by the sliding of a divergent lens.
C)the focusing divergent lens is situated at about the middle of the tube
D)all the above.

Question

Quizplus · Accepted Answer

In an internal focusing telescope, all the statements are correct: the objective is at a fixed distance from the diaphragm, focusing is achieved by sliding a divergent lens, and this divergent lens is typically located around the middle of the tube. This design allows for focusing without altering the telescope's length.

In an Internal Focusing Telescope