The diagram from Sir Isaac Newton's crucial experiment, 1666-72. A ray of light is divided into its constituent colors by the first prism (left), and the resulting bundle of colred rays is reconstituted into white light by the second.
He was Sir Isaac Newton. It was Sir Isaac Newton who published that a prism has the ability to assemble or disassemble light. The word spectrum was used in his reports that were published in 1671. It was Sir Isaac Newton who gave the idea of VIBGYOR also.
