The focus of a parabolic mirror is at a distance of \( 6 \mathrm{~c...

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The focus of a parabolic mirror is at a distance of \( 6 \mathrm{~cm} \) from its vertex. If the
\( \mathrm{P} \) mirror is \( 20 \mathrm{~cm} \) deep, find its diameter.

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