Explanation

Explanation: Optics is the branch of physics that studies the behavior, properties, and interactions of light. This includes: A. Nature of light waves: Understanding the wave nature of light is a fundamental part of optics. B. Properties of light: This encompasses various properties such as reflection, refraction, dispersion, and polarization. D. Lenses and mirrors: These are optical instruments that manipulate light to form images and are essential topics in optics. C. Characteristics of sound, on the other hand, is studied under acoustics, a different branch of physics that deals with sound waves and their properties.