Question

Go into a dark room with a flashlight and face the beam toward a wall. Change the flashlight's distance from the wall as well as the way you hold the flashlight. Which conic sections can you form? Explain.

Answer 1

circle, ellipse and parabola

the light is emitted in the shape of a cone. you can form all of the conic section with one cone except the hyperbola, because it is formed by two cones.