due to fast and continuous flickering of light, the object on which light is flashed appear slower, this can used to observe the fast moving object, in slowmotion
Strobes occur when continuous rotation or other periodic motion is represented by a series of short or instantaneous samples (as opposed to a continuous view) at a sample rate close to the period of motion. A visual phenomenon caused by aliasing. This is called the 'wagon wheel effect' because a wheel with spokes (such as a horse-drawn carriage) can appear to be spinning backwards in the video.
A fountain of lightning strobe lighting a stream of falling water droplets at regular intervals is an example of applying stroboscopic effects to periodic, non-rotational motion. Under normal light, it's a normal fountain. When viewed with a strobe light tuned to the falling speed of the droplets, the droplets appear to float in the air. Adjusting the blink rate can make the water droplets appear to slowly move up and down.
