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[" 12) If a parabolic reflector is "20cm...

[" 12) If a parabolic reflector is "20cm" in diameter "],[" and "5cm" deep,find its focus."]

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If a parabolic reflector is 20 cm in diameter and 5 cm deep, find its focus.

If a parabolic reflector is 20cm in diameter and 5cm deep,find the focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.