The principle of a stroboscope is to study rotating, reciprocating,  oscillating, or vibrations in objects. A stroboscope is used to  make cyclically moving objects appear s…tationary or slower. (MORE)

A stroboscopic light, or strobe light, is a device which discharges  flashes of light which causes moving objects to appear stationary  or slow-moving. The flashing light ha…s been known to cause seizures  in people who suffer from epilepsy. (MORE)