A parabolic reflector (see Figure 15.43) is constructed so that a cross section along its axis is
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A parabolic reflector (see Figure 15.43) is constructed so that a cross section along its axis is a parabola with the light source at the focus. Find the location of the focus if the reflector is \(16 \mathrm{~cm}\) across and its depth is \(8 \mathrm{~cm}\).
Figure 15.43
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