 # What is snells law?

7 years ago
a law stating that the ratio of the sines of the angles of incidence and refraction of a wave are constant when it passes between two given media.
7 years ago
Snells law:W
7 years ago
naSinθa=nbSinθb
7 years ago
a law stating that the ratio of the sines of the angles of incidence and refraction of a wave are constant when it passes between two given media.
7 years ago
Snell's law (also known as the Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.
7 years ago

Snell's law (also known as the Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

In optics, the law is used in ray tracing to compute the angles of incidence or refraction, and in experimental optics to find the refractive index of a material. The law is also satisfied in metamaterials, which allow light to be bent "backward" at a negative angle of refraction with a negative refractive index.

Although named after Dutch astronomer Willebrord Snellius (1580–1626), the law was first accurately described by the scientist Ibn Sahl at the Baghdad court in 984. In the manuscript On Burning Mirrors and Lenses, Sahl used the law to derive lens shapes that focus light with no geometric aberrations.

7 years ago
1. it stating that the ratio of the sines of the angles of incidence and refraction of a wave are constant when it passes between two given media.