A stroboscope is an instrument that emits short, bright flashes of light. It is commonly used to measure the speed of rotation of a machine or to make an object appear stationary even when it is moving rapidly.

The functioning of a stroboscope is based on the principle of persistence of vision. Our eyes tend to retain an image for a brief period of time after it has disappeared. When the stroboscope emits flashes of light at regular intervals, it creates an illusion of slow motion or stopped motion.

For example, if a stroboscope emits flashes of light at the same frequency as the rotation of a fan, the fan appears to be stationary. This is because the fan is in the same position each time the stroboscope emits a flash of light. Similarly, if the stroboscope emits flashes of light at a frequency that is slightly different from the rotation of the fan, the fan appears to be moving slowly or even backwards.

In essence, a stroboscope allows us to "freeze" or slow down motion so that we can observe it more closely. It is a valuable tool in many fields, including engineering, physics, and photography.

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