Solve the Problem $5 \mathrm {~m}$ Down from the Top of the Dome the Ceiling Is

question 77

Multiple Choice

Solve the problem.
-A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If $5 \mathrm {~m}$ down from the top of the dome the ceiling is $23 \mathrm {~m}$ wide, find the best location for the light source.

• A) \(26.5 \mathrm {~m}\) down from the top
• B) \(19.8 \mathrm {~m}\) down from the top
• C) \(13.2 \mathrm {~m}\) down from the top
• D) \(6.6 \mathrm {~m}\) down from the top

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