This is the law of refraction of light. It was first proposed by W. Snell in 1621. This law applies not only to light but also to general waves. When a wave enters an isotropic medium and refracts into another isotropic medium, the plane of incidence (the plane containing the direction of the incident wave and the normal to the boundary surface) and the plane of refraction (the plane containing the direction of the refracted wave and the normal to the boundary surface) are on the same plane, and if the angle of incidence is i and the angle of refraction is r , then they are related by sin i / sin r = n (constant), where n is the refractive index of the refracting medium with respect to the incident medium. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
光の屈折の法則。 1621年 W.スネルによって初めて提唱された。これは光だけでなく一般の波動についても成立する。波動が等方性の媒質から他の等方性の媒質に入射して屈折する場合,入射面 (入射波の方向と境界面の法線とを含む面) と屈折面 (屈折波の方向と境界面の法線とを含む面) は同一平面にあり,入射角を i ,屈折角を r とすれば, sin i/ sin r=n (一定) の関係にあり,n を屈折側の媒質の入射側の媒質に対する屈折率という。
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