自し然ぜん光こう

noun

natural light

General term for light from the sun or other natural sources, as opposed to artificial light (人工光).

See also: 人工光

• この部屋へやは自し然ぜん光こうがたくさん入はいるので明あかるい。

  This room is bright because it gets a lot of natural light.

noun

unpolarized light

Physics term for light whose electric field vibrates in all directions perpendicular to the direction of propagation.

• 自し然ぜん光こうは偏へん光こうフィルターを通とおすと偏へん光こうになる。

  Natural light becomes polarized when it passes through a polarizing filter.