![Principles of Interference | MicroscopyU](/e69yszg/293.jpg)
Principles of Interference | MicroscopyU
Light waves exiting the first slit are then made incident on a pair of slits positioned close together on a second barrier. A detector screen is placed in the region behind the slits to capture overlapped light rays that have passed through the twin slits, and a pattern of bright red and dark interference bands becomes visible on the screen.