Double-Slit Experiment

About This Experiment

The double slit experiment reveals the fundamental mystery of quantum mechanics. When light passes through two slits, it creates an interference pattern described by d sin θ = mλ, where d is slit separation, θ is the angle to bright fringes, m is the order, and λ is wavelength.

The remarkable discovery is that even single photons create the same pattern over time, suggesting each photon somehow passes through both slits simultaneously. This demonstrates wave-particle duality - light behaves as both wave and particle depending on how we observe it.