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Solve the Problem. -A Reflecting Telescope Contains a Mirror Shaped Like a Paraboloid

Question 59

Multiple Choice

Solve the problem.
-A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 20 inches across at its opening and is 5 feet deep, where will the light be concentrated?


A) 5 in. from the vertex
B) 1.3 in. from the vertex
C) 0.6 in. from the vertex
D) 0.4 in. from the vertex

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