屈くっ折せつ角かく

noun

angle of refraction

Technical term in optics and physics; used in scientific contexts.

• 光ひかりが水みずに入はいるとき、屈くっ折せつ角かくは入にゅう射しゃ角かくより小ちいさくなる。

  When light enters water, the angle of refraction becomes smaller than the angle of incidence.