how to decrease spherical aberration in lens
Answers
The curved surface of a lens is most often spherical (this shape is easy to make). When light refracts through a lens with a spherical surface, the rays that pass through the outer diameters of the lens will focus at a different point from rays that pass through the center. This causes the resulting image to be blurred.
When light is refracted from the outer vs. inner portions of the curved surface of a spherical converging lens or diverging lens, the resulting image is blurred along the optic axis (i–ii).
The shape of a spherical lens causes a problem called spherical aberration. In spherical aberration, parallel light rays that pass through the central region of the lens focus farther away than light rays that pass through the edges of the lens. The result is many focal points, which produce a blurry image.