" ( "P_(1)" If a parabolic reflector is "20" cm in diameter and "5" cm deep,find the focus."

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

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

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

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

If a parabolic reflector is 24 cm in diameter and 6 cm deep, find its focus.

If the parabolic reflector is 20cm in diameter and 5cm deep find it's focus.

(i) If a parabola reflector is 20cm in diameter and 5cm deep.Find its focus.(ii) An arc is in the form of a parabola with its axis vertical. The arc is 10m high and 5m wide at the base. How wide is it 2m from the vertex of the parabola.