"Geometrical optics, or ray optics, is a model of optics that describes light propagation in terms of rays."
Study of light as rays and their interaction with optical materials and systems.
"The ray in geometrical optics is an abstraction useful for approximating the paths along which light propagates under certain circumstances."
"The simplifying assumptions of geometrical optics include that light rays: propagate in straight-line paths as they travel in a homogeneous medium."
"Light rays...may bend, and in particular circumstances may split in two, at the interface between two dissimilar media."
"Light rays follow curved paths in a medium in which the refractive index changes."
"Geometrical optics does not account for certain optical effects such as diffraction and interference."
"This simplification is useful in practice; it is an excellent approximation when the wavelength is small compared to the size of structures with which the light interacts."
"The techniques are particularly useful in describing geometrical aspects of imaging, including optical aberrations."
"Geometrical optics, or ray optics..."
"...describes light propagation in terms of rays."
"Approximating the paths along which light propagates under certain circumstances."
"Light rays propagate in straight-line paths as they travel in a homogeneous medium."
"Light rays...may bend, and in particular circumstances may split in two, at the interface between two dissimilar media."
"Light rays follow curved paths in a medium in which the refractive index changes."
"Certain optical effects such as diffraction and interference."
"It is an excellent approximation when the wavelength is small compared to the size of structures with which the light interacts."
"Describing geometrical aspects of imaging, including optical aberrations."
"This simplification is useful in practice..."
"It is an excellent approximation when the wavelength is small compared to the size of structures with which the light interacts."
"Geometrical optics, or ray optics..."