Final answer:
The Newtonian telescope has a concave primary mirror and a flat secondary mirror with an eyepiece on the top side of the tube.
Step-by-step explanation:
The design of a telescope with a concave primary mirror and flat secondary mirror, where the eyepiece is located on the top side of the telescope tube, is known as the Newtonian telescope. In this design, after light is collected by the concave mirror at the bottom of the telescope, it is reflected to a flat secondary mirror near the top of the tube. This secondary mirror then directs the light to the side of the tube, where the eyepiece is situated, allowing for observation.