(a) Explain with the help of a labelled diagram how can a combination of two prisms be used so that an incident white light emerge out of second prism as white light.
(b) Name the scientist who first performed this activity.
(c) Explain the term spectrum in brief
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a) The seven different colours can be recombined in the following way to give white light :
1.A triangular prism is placed on its base and another similar prism is placed along its side in inverted position on its vertex. so that the refracting surface is in the opposite direction.
When a beam of white light is allowed to fall on the first prism then a ordinary white light is obtained on the screen placed behind the second prism
The first prism splits the white light into 7 colours and second prism recombines into white light.
b) Sir Issac Newton has performed the above activity.
c) Spectrum is defined as A band of colors with a particular wave length produced due to dispersion of white light as in case of rainbow
1.A triangular prism is placed on its base and another similar prism is placed along its side in inverted position on its vertex. so that the refracting surface is in the opposite direction.
When a beam of white light is allowed to fall on the first prism then a ordinary white light is obtained on the screen placed behind the second prism
The first prism splits the white light into 7 colours and second prism recombines into white light.
b) Sir Issac Newton has performed the above activity.
c) Spectrum is defined as A band of colors with a particular wave length produced due to dispersion of white light as in case of rainbow
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