Explore: Optical Paths

generalized as a path integral as part of the ray tracing procedure. A difference in OPL between two paths is often called the optical path difference (OPD)

from a single source is split into two beams that travel in different optical paths, which are then combined again to produce interference; two incoherent

Optical path (OP) is the trajectory that a light ray follows as it propagates through an optical medium. The geometrical optical-path length or simply

material. Optical depth is dimensionless, and in particular is not a length, though it is a monotonically increasing function of optical path length, and

curved paths in a medium in which the refractive index changes may be absorbed or reflected. Geometrical optics does not account for certain optical effects

In optics, the refractive index (or refraction index) of an optical medium is the ratio of the apparent speed of light in the air or vacuum to the speed

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a fraction of a wavelength over long optical paths, requiring very precise optics. Practical infrared and optical astronomical interferometers have only

space Optical path length, the product of the distance light travels and the refractive index of the medium it travels through Mean free path, the average

rather than transmitted through it. The instrument uses two separate optical paths with two objectives and eyepieces to provide slightly different viewing