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A narrow beam PQ of white light passes t...

A narrow beam PQ of white light passes 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 DE.
(1) Write the name and cause of the phenomenon observed.
(2) Where else in nature is this phenomenon observed ?
(3) Based on this observation, state the conclusion which can be drawn about the constituents of white light.

Text Solution

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(1) The phenomenon of splitting of white light into its constituent colours is called dispersion of light. It occurs because different constituent colours of light travel with different speeds in a material medium (other than air /vacuum) and hence bend through different angles.
(2) In nature, this phenomenon is observed in formation of a rainbow.
(3) Based on the phenomenon of dispersion, we can conclude that
(a) White light consists of seven colours.
(b) Violet light suffers maximum deviation and red light suffers minimum deviation.
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