double-slit experiment

The double-slit experiment demonstrates how light and particles, like electrons, behave both as waves and particles. When light is shone through two closely spaced slits, it creates an interference pattern on a screen, suggesting wave behavior. However, when particles are sent through one at a time, they still create the same pattern over time, implying they act like waves. This reveals that observation affects behavior; when we measure which slit a particle goes through, it behaves like a particle instead of a wave. This experiment challenges our understanding of reality and the nature of observations in quantum physics.