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Magic Mirror

Mobile Science Museum · Optics

Operation: 1. Observe the shape of the opening at the top of the model; 2. Rotate the turntable by a certain angle, observe and compare the actual shape of the model with its shape in the mirror. Function Overview: The exhibit consists of a plane mirror, a specially made model set, a rotatable turntable, etc. Rotate the turntable and compare the physical model with the image formed in the mirror; you will find that the image and the physical object have different shapes. Think about why this is? Scientific Principle: Why does the actual opening shape of the model differ from its shape in the mirror when observed from certain angles? The image of an object is transmitted to the brain through the eyes, and processed by the brain so that we understand it. However, when processing shapes, our brain always tends to interpret objects as shapes we are familiar with, discarding some extra details or filling in missing ones. The edge of the model's opening in the exhibit is neither a simple straight line nor an arc, but concave on one side and convex on the other, like a lying S shape. When observed from the concave side, the opposite convex curve looks more like an arc, and the brain interprets this strange geometric body as the familiar cylinder. At this time, the object in the mirror is equivalent to being observed from the convex side, and the opposite concave curve looks more like a straight line, so the brain interprets it as the familiar rectangular prism. Observing things from different angles often yields different information, which is the principle described in the ancient poem: "From the side, it's a ridge; from the front, a peak."

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