Parabolic Reflector A lamp with a parabolic reflector isshown in the figure. The bulb is

Chapter 11, Problem 61

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Parabolic Reflector A lamp with a parabolic reflector isshown in the figure. The bulb is placed at the focus, and thefocaldiameter is 12 cm.(a) Find an equation of the parabola.(b) Find the diameter d1C, D2 of the opening, 20 cm fromthe vertex.

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