Mathematics, 25.11.2021 06:00 boo2023

The reflector of a flashlight is in the shape of a parabolic of revolution. Its diameter is 8 centimeters and it’s depth is 4 centimeters. How far from the vertex should the light bulb be placed so that the rays will be reflected parallel to the axis?

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The reflector of a flashlight is in the shape of a parabolic of revolution. Its diameter is 8 centim...

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