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I need help with this question I am not sure what I need to do. Chapter 8, Exercises for Section 8.1, Question 12ab A parabolic

I need help with this question I am not sure what I need to do.

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Chapter 8, Exercises for Section 8.1, Question 12ab A parabolic reector 3 " in diameter and 2 " deep is proposed for a spotlight. Enter the exact answers. a. What formula Is needed for manufacturlng the reector? y=ax2 wherewo, a: in. Where would the focus be? inches from the vertex. 2a

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