幾き何か光こう学がく

noun

geometrical optics

Technical term in physics; the branch of optics that treats light as rays.

• 幾き何か光こう学がくでは、光ひかりの反はん射しゃと屈くっ折せつを光こう線せんとして扱あつかう。

  In geometrical optics, reflection and refraction of light are treated as rays.