Question

what will happen when another similar glass prism is placed upside down behind another prism

Answer 1

when the white light is passed through the 1st prism, it splits into its various colours.
when another prism is placed upside down beside that prism, the various colours pass through the it and form a white light back.

Answer 2

when the light passes through the 1st prism it splits into seven colours and when the seven colours again passed to the 2nd prism placed upside down it again transformed into white light..


hope it will help u..