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If a parabolic reflector is 20 cm in diameter and 5 cm deep, then the distance from vertex to focus is

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answer is 5.

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Detailed Solution

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Parabola is  y2=4ax⇒100=4a(5)⇒a=−5
Focus lies at a distance of 5 units from vertex.

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If a parabolic reflector is 20 cm in diameter and 5 cm deep, then the distance from vertex to focus is