Physics
Physics
Problem
State the condition, expressed in terms of path difference , for the occurrence of a bright fringe in Young’s double-slit interference.Intuitive explanation
Interference happens when two waves from the slits arrive at a point on the screen; if they're in step (same phase), they reinforce each other into a bright fringe. The key insight is that "in step" means the extra distance one wave travels compared to the other must be a whole number of wavelengths—so the crests and troughs line up perfectly and add constructively.
Intuitive explanation
Interference happens when two waves from the slits arrive at a point on the screen; if they're in step (same phase), they reinforce each other into a bright fringe. The key insight is that "in step" means the extra distance one wave travels compared to the other must be a whole number of wavelengths—so the crests and troughs line up perfectly and add constructively.