A) By providing different suitable curvature to its two surfaces
B) By combining it with another lens of opposite nature
C) By reducing its aperture
D) By providing proper polishing of its two surfaces
Correct Answer: B
Solution :
A lens can be considered to be made up of a large number of small prisms. When a ray of white light passes through a lens, it gets dispersed in its constituent colours due to which the image of a white object is coloured and blurred. Thus, formation of a coloured and blurred image of a white object by a lens due to dispersion is called the chromatic aberration. To correct this aberration achromatic combination of lenses is required which is a combination of two lenses of opposing nature. It means one is convex and other concave joined by a transparent Canada balsam layer. Note: If we use monochromatic light there will be no chromatic aberration. Moreover this aberration is found only in lenses, not in mirrors.
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