angle of incidence
noun [ C ] physics specialized uk/ˌæŋ.ɡəl əv ˈɪn.sɪ.dəns/ us/ˌæŋ.ɡəl əv ˈɪn.sɪ.dəns/
入射角
the angle that a beam of light touching a surface makes with a line vertical to that surface
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