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CBSE Class 12-science Answered

to remove the chromatic aberration the combination of lenses should be such that-                         A)Fr+Fv =0  (b) Fr>Fv (c) Fr<Fv (d.) Fr-Fv=0. [where Fr or Fv represents the equivalent focal lengths of the combination for red and violet colours.]  please explain it clearly.?     
Asked by Nidhi | 24 Dec, 2014, 01:41: PM
answered-by-expert Expert Answer
Chromatic aberration is produced in a lens because the focal length for different colours is different and so is the refractive index.
Hence, equivalent focal length for red coloured light (Fr) is different than the equivalent focal length for violet coloured light (Fv).
 
So, for the removal of chromatic aberration, the combination of lenses should be such that this mean difference between red and violet (or any other colour) is zero.
 
Hence, Fr - Fv = 0
Answered by Romal Bhansali | 24 Dec, 2014, 07:40: PM

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