The convex secondary mirror in this design focuses light down through a hole cut in theconcave primary mirror.
A)refractor
B)prime focus reflector
C)Newtonian reflector
D)Cassegrain reflector
E)interferometer

Question

Quizplus · Accepted Answer

The description matches that of a Cassegrain reflector, which uses a convex secondary mirror to reflect light back up through a hole in the primary mirror. This is different from a Newtonian reflector, which uses a flat secondary mirror at a 45-degree angle to reflect light out through the side of the telescope. The Cassegrain reflector design uses a convex secondary mirror to reflect light back through a hole in the concave primary mirror, allowing for a longer focal length in a more compact design.

The Convex Secondary Mirror in This Design Focuses Light Down