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Dispersion Through a Prism

The splitting of white light into its constituent colors is called dispersion of light.
 
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Fig. 30

Angular dispersion (θ)

Angular separation between extreme colors, i.e., θ = δV – δR = (μVμR)A. It depends upon μ and A.
 
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Fig. 31

Dispersive power (ω)

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Therefore, it depends only upon the material of the prism, i.e., μ and does not depend upon the angle of prism A

Combination of prisms

Two prisms (made of crown and flint material) are combined to get either dispersion only or deviation only.
  • Dispersion without deviation (chromatic combination)
     
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    113543.png
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Fig. 32
  • Deviation without dispersion (achromatic combination)
     
    113551.png
     
    113557.png
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Fig. 33




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