SOLUTION: A parabolic eavesdropping device is used by an intelligence agent to record terrorist conversations. The parabolic surface measures 120 cm in diameter at the top and is 20 cm deep

Question 1160971: A parabolic eavesdropping device is used by an intelligence agent to record terrorist conversations. The parabolic surface measures 120 cm in diameter at the top and is 20 cm deep at its center. How far from the vertex should the microphone be located?
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
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The parabolic surface measures 120 cm in diameter at the top and is 20 cm deep at its center. How far from the vertex should the microphone be located?
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Putting vertex at (0,0) and two points (-60,20) and (60,20),

Focus is d cm from vertex.

from vertex
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