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What is lens aberration? Lens aberration are the defects in lens because of which, image formed deviates from the ideal one. They can be divided into two types: 1) Monochromatic aberration 2) Chromatic aberration. Some of the types of monochromatic aberration are: a) Spherical lens aberration b) Coma lens aberration c) Curvature lens aberration d) Distortion lens aberration e) Astigmatism Out of these, spherical aberration is more common. lens aberration Spherical Lens aberration Spherical aberration arises on account of inability of the lens to focus paraxial/central rays and marginal/peripheral rays from an object at the same point. The image of the object is, therefore, blurred. The magnitude of linear/axial spherical aberration = (fc-fm), where fc is focal length of the lens for central rays and fm is focal length of the lens for marginal rays. The linear spherical aberration is positive for a convex lens and negative for a concave lens. To remove spherical ab...