Mathematics, 02.10.2021 22:00, nightwolf8999
The bulb of the flashlight is placed at the focus above the parabolic reflector. If the surface is 4.5 inches across and the bulb is 1 inch above the vertex, how deep is the reflector at the vertex?
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The bulb of the flashlight is placed at the focus above the parabolic reflector. If the surface is 4...
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