A cross-section of a parabolic reflector is shown in the
Chapter 10, Problem 10.342(choose chapter or problem)
A cross-section of a parabolic reflector is shown in the figure. The bulb is located at the focus and the opening at the focus is 10 cm. (a) Find an equation of the parabola. (b) Find the diameter of the opening , 11 cm from the vertex.
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