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If a parabolic reflector is 20 cm in dia...

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

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The diameter of the parabolic reflector is 20 cm and the depth is 5 cm.
Let the origin of the coordinate plane be at the vertex of the parabolic reflector in such a way that the axis of reflector is along the x axis.
Assume that the parabola opens to the right.
The equation of the parabola along with x axis and opening towards right is,
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