Cassegrain Reflector:

Figure below shows the design of the Cassegrain reflector. The eyepiece mirror is build up closer to the objective than it is in the Newtonian design. It is not angled, though it is convex. The convexity of this mirror raises the effective focal length of the objective mirror. The light reflects from the convex mirror and passes via a small hole in the middle of the objective having the eyepiece.

Figure: In the Cassegrain reflector, the eyepiece is in the middle of the objective mirror.

The Cassegrain reflector can be prepared with a physically short tube and an objective mirror with more curvature than that of a Newtonian telescope containing the similar diameter. Since an outcome, the Cassegrain telescope is less huge and less bulky. The Cassegrain reflectors with heavy-duty mountings are physically steady, and they can be used at low magnification to acquire a wide view of a large part of the sky.