DISCUSS: Light Cone from a Flashlight A flashlight shines on a wall, as shown in the figure. What is the shape of the boundary of the lighted area? Explain your answer.
The shape of the boundary of the lighted area from a flashlight.
The definition of an ellipse,
The shape of an ellipse is oval and a closed plane curve generated by a point moving in such a way that the sum of its distance from two foci is a constant.
A flashlight also looks like an oval shape and the shape of the boundary of the lighted area make a closed plane curve generated by a poi...
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