Optical Aberrations: Spherical and Chromatic

This lecture covers the paraxial equation in dioptres, the exact expression by Snell and Fermat, and the development to 3rd order. It explains spherical aberration, astigmatism, coma, and field curvature in lenses. The correction of aberrations using complex lenses and the concept of the achromatic doublet are also discussed, along with the impact of dispersion on chromatic aberration.