菲涅耳透镜 fēiniè'ěrtòujìng Fresnel lens Definitions Defs Origin Strokes Stroke Words Sentences Sents 菲涅耳透镜 菲湼耳透鏡 fēiniè'ěrtòujìng Fresnel lens a thin, flat lens consisting of a series of concentric steps used to focus light
菲涅耳透镜 菲湼耳透鏡 fēiniè'ěrtòujìng Fresnel lens a thin, flat lens consisting of a series of concentric steps used to focus light
