幾何光學 [几－－学]

Jyutping gei2 ho4 gwong1 hok6
Pinyin jǐ hé guāng xué

Definitions (CC-CEDICT)
  1. geometric optics
Definitions (Wiktionary)
  1. noun
    geometrical optics (the study of light propagation as geometrical constructs, such as rays, instead of waves or photons)