The document describes the internal optics of a modified cassegrain reflector, highlighting its compact design achieved by folding light similar to binoculars. It emphasizes the convex shape of the secondary mirror, which is not plano. The document also requests clear labeling of the objective, eyepiece, and secondary mirror.

1. Figure 4 shows the internal optics of a modified reflector, called a Cassegrain reflector. The light
is folded, much like in binoculars, to provide a compact design. Notice that the secondary mirror
is convex, and is not plano.
Clearly and neatly label the objective and the eyepiece, and the secondary mirror.
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