Science
A narrow beam XY of white light is passing through a glass prism ABC as shown in the diagram :
Trace it on your answer sheet and show the path of the emergent beam as observed on the screen PQ.
Name the phenomenon observed and state its cause.
Refraction Plane Surfaces
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Answer
The path of the emergent beam is shown in the diagram below:
The phenomenon of the splitting up of the white light into its constituent colours is called dispersion of light.
The cause of dispersion of white light is the change in speed of light with wavelength.
When white light enters the first surface of a prism, light of different colours due to their different speeds in glass, get deviated through different angles towards the base of the prism. On the second surface of prism, only refraction takes place (from glass to air) and different colours are deviated through different angles. As a result, colours get further separated on refraction at the second surface.
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