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What are defects of lens????
spherical abrasion and chromatic abration
Dear student,
Lens Defects
µv > µR so fR > fV
Mathematically chromatic aberration = fR – fv = ωfy
ω = Dispersive power of lens.
fy = Focal length for mean colour √fRfv
Removal: To remove this defect i.e. for Achromatism we use two or more lenses in contact in place of single lens.
Mathematically condition of Achromatism is : ω1/f1 + ω2/f2 = 0
or ω1f2 = –ω2f1
Inability of a lens to form the point image of a point object on the axis is called Spherical aberration.
In this defect all the rays passing through a lens are not focused at a single point and the image of a point object on the axis is blurred.
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