Spherical Aberration

Spherical Aberration

Distorted Image

Introduction to Spherical aberration

Spherical Aberration

1.  Till now, our study was limited to the mirror of a very small aperture. If we consider a spherical mirror having a Large aperture, then the assumption that light parallel to the principal axis meets at a focus does not hold good.
2. The relation (F = R/2 ) giving a single point focus is not followed and the image does not converge at a single point which leads to a distorted image.
3. This phenomenon is called spherical aberration.
4. This is due to the spherical shape of the mirror, hence called spherical aberration.
5. The ray very close to the principal axis is called paraxial rays.
6. The ray far away or at the edge of the mirror is called s marginal Rays.

Remedies for Spherical Aberration:

1. It can be reduced by using a mirror of a very small aperture.
2. It can be completely eliminated by using a parabolic mirror

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