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CBSE XI
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Math
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Conic Sections
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Q)
If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.
$\begin {array} {1 1} (A)\;a=-5 & \quad (B)\;a=5 \\ (C)\;a=10 & \quad (D)\;a=-10 \end {array}$
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