Halogen Lamp (AR Modeling Challenge)

Topic:
Parabola
The goal of this GeoGebra Augmented Reality modeling challenge is to author 2 surface equations (with domain restrictions) that model the halogen lamp seen in the screencast below. Modeling Clues: 1) Both surfaces are parts of 2 different paraboloids of revolution. 2) The blue surface is part of a paraboloid with vertex (0,0,0). The point lies on the blue surface. The radius of the bottom circle = 1. The radius of the top circle = . 3) The pink surface is part of a paraboloid with vertex (0, 0, 0.5). There is absolutely no overlap between the blue surface and pink surface.

Quick (Silent) Demo