Describe an activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.

Describe an activity to show that the colours of white light splitted

1.	Describe an activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.
Answer» Solution :Allowa NARROW beam of white LIGHT to fall on a PRISM `P_(1)`. The emergent light consists of seven colours and thus a SPECTRUM is formed. When a second identical prism `P_(2)` is placed in an inverted POSITION with respect to the first prism `P_(1)` as shown in Fig. 11.10, the seven coloured rays recombine to form white light again.