Optics Start with the basics

This note covers the following topics: light
basics, wavelength and frequency, reflection, refraction, dispersion, lenses and
mirrors, spherical lens or mirror, concave VS convex, focal point, focal length,
spherical aberration in lenses, reducing spherical aberration in lenses
interactive, the lens doublet corrects spherical aberration, parabolic shape
eliminates spherical aberration, correcting spherical aberration in mirrors,
chromatic aberration: a problem of lenses, the lens doublet corrects chromatic
aberration, atmospheric absorption of light, why stars twinkle: atmospheric
distortion of light, light pollution.

**Author(s):** NA

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