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If a parabolic reflector is 20 cm in dia...

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

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

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