Q:

# How do you correct spherical aberration?

A:

Spherical aberration in mirrors is usually corrected by using a mirror which is not a sphere. A parabolic mirror is often used instead of a spherical mirror. In lenses, the simplest method for minimizing spherical aberration is to use an aperture in front of the lens. Symmetric doublets, such as the orthoscopic doublet, are also efficient in greatly reducing the spherical aberration in lenses.

## Keep Learning

Credit: rayand CC-BY-2.0

Spherical aberration happens because the light rays fail to converge at a single point when using a spherical mirror or a lens. In lenses, the light waves that pass through the outer edges of a spherical lens are refracted more than the ones that pass through the center. Spherical aberration cannot be eliminated completely from a single lens, but it can reduced by bending the lens in its "best form." Coddington shape factor is used for characterizing the degree of bending.

Similarly, the light waves reflected from the outer edges of a spherical mirror focus closer to the mirror than the rays that reflect from the central part of the mirror. A parabolic mirror's outer edges differ significantly from a spherical mirror, and they form clear, sharp images that lack the blurriness associated with the images formed by spherical mirrors.

Sources:

## Related Questions

• A: Concave mirrors are used in car headlights, flashlights, telescopes, microscopes, satellite dishes and camera flashes. Dentists and ear, nose and throat do... Full Answer >
Filed Under:
• A: A kaleidoscope works by reflecting light that bumps into a reflective surface such as a mirror. It has two or more mirrors placed at an angle to each other... Full Answer >
Filed Under:
• A: A convex mirror placed upside down or upright does not invert the image of its subject. A convex mirror bows outward, and therefore its focal point is behi... Full Answer >
Filed Under:
• A: A convex mirror is in the shape of a curve, and the reflecting surface bulges outward toward the source of light. Because convex mirrors reflect the light ... Full Answer >
Filed Under:
PEOPLE SEARCH FOR