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State the cause of dispersion, when white light enters a glass prism. Explain with a diagram. |
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Answer» The cause of dispersion 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 glasses gets deviated towards the base of the prism through different angles that is the Dispersion of white light into its constituent colours takes place at the first surface of prism. Newton showed that the reverse of dispersion of light is also possible. He kept two prisms close to each other one in erect position and the other in an inverted position. The light gets dispersed when passes through the first prism. The second prism receives all the seven coloured rays from, first prism and recombines them into, original white light. This observation shows that sunlight is made Up of seven colours. Any light that given spectrum similar to that of sunlight is called white light. |
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