This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Young Diffraction. PDold Moved from the en org YoungDiffraction Thomas Young's sketch of twoslit diffraction of light Narrow slits at and act as sources and waves interfering in various phases are shown at and Young presented the results of this experiment to the Royal Society in Scanned from modern book Doubleslit experiments