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Dispersion is the splitting of white light into its constituent colors when it passes
               through a transparent medium. A spectrum is a band of colors that results from the
               dispersion of white light.

               Newton deduced from the preceding experiment that white light is a mixture of
               seven different colors.





               Tracing the Path of Light through a Prism

               Let us now trace light's path through a prism. Trace the ABC boundary of a prism
               on a white sheet of paper with the triangular face on the sheet.


               Attach two T and S pins to one side.

               Place the prism on the ABC boundary.


               Fix two more pins Q and R through the other side so that all four pins appear to be
               in the same line.

               Remove the pins and make a note of where they are.


               Connect  TS  and  RQ  and  extend  them  to  meet  the  prism  faces  at  P  and  O,
               respectively. Participate in PO.










               Class X Science                                 www.vedantu.com                                                          43
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