Pendulum And Spherical Mirror

Purpose

Optical illusion using concave mirror.

Equipment

Pendulum and hemispherical mirror setup as photographed.

Images

l3-22

Description

A pendulum hangs at the center of curvature of a hemispherical mirror. When the pendulum is pushed so that it moves in circles around the center of curvature, the image also moves in circles around the center of curvature, but on the opposite side of the center of curvature.

References

Terrence P. Toepker, Spherical Mirror Images of Dynamic Objects, TPT 30, 252-253 (1992).