Solve the problem.A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 18 inches across at its opening and is 5 feet deep, where will the light be concentrated?
A. 0.3 in. from the vertex
B. 1.4 in. from the vertex
C. 0.7 in. from the vertex
D. 4.1 in. from the vertex
Answer: A
Mathematics
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