Correct option: C.Is minimum when the total deviation is equally distributed over the two surface
c
Spherical aberration is a type of aberration found in optical system that use elements with spherical surfaces. Lenses and curved mirrors are often made with surfaces that are spherical, because this shape is easier to form than non-spherical curved surfaces. Light ray that strike a spherical surface aff-centre are refracted or reflected more or less than those that strikes close to the centre. This deviation reduces the quality of images produced by optical systems In lens systems, aberrations can be minimized using combinations of convex and concave lenses, or by using aspheric lenses or aplanatic lenses.
