A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 8 inches across at it's opening and is 6 inches deep, where will the light be concentrated
1/9 Inch above vertex
To find where the light will be concentrated in a reflecting telescope with a paraboloid-shaped mirror, you need to determine the focal point of the mirror.
The focal point of a paraboloid mirror is located at a distance from the vertex of the mirror equal to half of its depth. In this case, the mirror has a depth of 6 inches, so the focal point will be 3 inches from the vertex.
Since the mirror is 8 inches across at its opening, the vertex is located at the center of the mirror, 4 inches from either side. Therefore, the focal point will be 3 inches from the vertex in the center of the mirror.
To summarize, the light will be concentrated at a point 3 inches from the vertex of the mirror, in the center.