Perfectly reflective surface - Perfectly reflective surface

…Reflection from a paint surface, where light is repeatedly reflected and refracted from the time it enters until it leaves, is also a type of diffuse reflection, which allows the eye to see an object from many different directions. If the distribution of reflected light intensity does not depend on the direction of the incident light, but is proportional to the solid angle into which the reflecting surface is viewed, the reflecting surface is called a perfect diffuse reflecting surface. A sphere with a perfect diffuse reflecting surface on the inside is called an integrating sphere, and is used to measure the absorption rate of objects with complex shapes, the transmittance of lenses that bend light, and the efficiency of fluorescent light that spreads in all directions. …

*Some of the terminology that refers to "perfectly diffuse reflecting surface" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…光が入射してから射出するまで何回も反射や屈折を繰り返すような塗料面の反射も乱反射の一種で，そのためいろいろな方向から目で物体を認識できる。反射光強度の分布が入射光の方向に依存せず，反射面を見込む立体角に比例するような場合，その反射面を完全拡散反射面と呼ぶ。内側を完全拡散反射面にした球を積分球といい，形の複雑な物体の吸収率や，光が曲がるレンズの透過率，四方に広がる蛍光の効率などの測定に用いられる。…

※「完全拡散反射面」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報