The study of light, its propagation, interaction with matter, imaging and measurement.
What is optics?
Optics is the study of light and its interaction with matter.
It includes geometric optics, which models rays and images, and physical optics, which treats light as a wave. Quantum optics studies light as quantized excitations and its interaction with atoms.
Why does it matter?
Optics enables lenses, microscopes, cameras, telescopes, fiber communication, lasers, spectroscopy, medical imaging and precision measurement.
It connects fundamental physics to tools that extend human vision and communication.
Core phenomena
Reflection changes direction at a surface. Refraction changes direction when speed changes in a new medium. Interference combines waves. Diffraction spreads waves around openings and edges. Polarization describes field orientation.
Future
Photonics will move more information, sense environments and perform computation. Adaptive optics, integrated photonics and quantum optical devices may improve astronomy, medicine, manufacturing and secure communication.
Ai disclosure: written with the help of AI (ChatGPT). You are encouraged to point out errors and omissions.  
