Describe an experiment to discuss the recombination of dispersed light.

(N/A) Isaac Newton was the first to use a glass prism to obtain the spectrum of sunlight. He tried to split the colours of the spectrum of white light further by using another similar prism. However,he could not get any more colours.
He then placed a second identical prism in an inverted position with respect to the first,as shown in the diagram. This allowed all the colours of the spectrum to pass through the second prism. He found a beam of white light emerging from the other side of the second prism. This observation gave Newton the idea that sunlight is made up of seven colours.