Step-by-step Answer
PAGE: 641SET: ExercisesPROBLEM: 66
Please look in your text book for this problem Statement

The distance from vertex to focus is and depth is .

Set the vertex of the parabola is at and it opens up.

The general form of the parabola  is , where is distance from vertex to focus.

Thus the value of and the points on the parabola are and .

Substitute and in .

Where is the diameter of the headlight.

Therefore, the diameter of the headlight is  .

The diameter of the headlight is  .


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