1. The reflecting telescope contains the mirror shaped like the parabola of revolution. If mirror is 18 inches Across at opening and is 2 feet deep where will the light be concentrated?
2. Reflecting telescope has the mirror shaped like the parabola if revolution. If distance of vertex to focus is 25feet and distance across top of mirror is 62 inches how deep is mirror?
3. Bridge is built in shape of the parabolic arch. Bridge arch has the span of 200feet and maximum height of 25feet. Determine height of arch at 20 feet from its center.