Answer;
b. using a combination lens made up of lenses, each of which has a different index of refraction
-Using a combination lens made up of lenses, each of which has a different index of refraction -will not be useful in trying to correct spherical aberration.
Explanation;
-Spherical Aberration is an optical problem that occurs when all incoming light rays end up focusing at different points after passing through a spherical surface.
-Spherical aberration may be reduced by placing an aperture, hole or "stop", in front of or after the lens. The aperture blocks out rays that blur the image. Using a diaphragm to block outside rays of light, using a circular stop to block out the outside rays of light and also using proper grinding when an object is at a specific distance from the lens, may be used to correct the problem of spherical aberration.
