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Draw a Five-Pointed Star

Mobile Science Museum · Optics

Operation: Press the "Start" button, hold the stylus, look at the image in the mirror, and try to trace a five-pointed star along the track on the baseboard. Function Overview: The exhibit consists of a plane mirror, a panel with a five-pointed star outline, a metal stylus, a digital display, LED lights, and a button. Press the button, hold the stylus, look at the image in the mirror, and trace a five-pointed star along the track on the baseboard. You will find that although it is usually very simple to draw a five-pointed star, why do you "repeatedly make mistakes" here? Scientific Principle: Why do you "repeatedly make mistakes" here? Because the five-pointed star in the mirror is the image formed by a plane mirror; it is the same size as the object but reversed left to right. When drawing a five-pointed star while looking at the image in the mirror, the direction of your hand movement is left-right reversed relative to the actual figure, and the stylus often disobediently deviates from the track, resulting in hand-eye incoordination. After repeated practice, the brain will gradually adapt to this change. Plane mirrors are widely used; dancers use them to correct their posture, and periscopes made using the principle of plane mirrors can observe conditions above the water from underwater.

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