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Algebra
Pregunta

A lamp with a parabolic reflector is shown in the ...

A lamp with a parabolic reflector is shown in the figure. The bulb is placed at the focus, and the focal diameter is \( 12 cm \) . 

(a) Find an equation of the parabola. 

(b) Find the diameter \( d ( C , D ) \) of the opening, \( 20 cm \) from the vertex. 

Answer

\(\text { (a) } y ^ { 2 } = 12 x \quad \text { (b) } 8 \sqrt { 15 } \approx 31 cm\)

Solución
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