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9) In a flashlight, the bulb is placed at the focus of a parabolic reflector. If the opening at the bulb is 10cm as shown

9) In a flashlight, the bulb is placed at the focus of a parabolic reflector. If the opening at the bulb is 10cm as shown below, find how far the bulb is placed along its axis from the vertex. V = O , O 5 cm 5 em

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