phy1020.DVI

using a lower-energy photon that will minimize the disturbance to the photon we’re observing — and if we
do this, the interference pattern does indeed return. But a low-energy photon also has a long wavelength, and
the wavelength is now sufficiently long that it’s no longer possible to tell which slit the original photon went
through. It’s as though Nature conspires against us to prevent us from determining which slit the photon goes
through.