Question

All are monochromatic abbreviations of mirrors and lenses except:

spherical abbreviation

astigmatism

coma

field curvature

distortion

diffraction

Answer 1

First of all, it is not monochromatic abbreviations. It is monochromatic aberrations

Chromatic aberration is the unintended separation of colors that can happen in lenses or mirrors. When optical aberrations distort monochromatic light, the effect is called monochromatic aberration.

There are five known monochromatic aberrations :

1. Spherical Aberrations
2. Astigmatism
3. Coma
4. Field Curvature
5. Distortion

Hence, Diffraction is not a monochromatic aberration.

Therefore answer is Diffraction