If the band of 7 colours obtained after dispersion from a prism is passed through another inverted prism, then
1
The band of 7 colours split into 14 colours
2
The band of seven colours do not split further and we get 7 colours at the output of the second prism.
3
Beam of white light is observed at output of second prism.
4
The band of seven colours split in 10 colours