Fresnel lens
زبان مبدأ: انگلیسی
ترجمه به فارسی
- واژهنامه · Merriam-Webster Collegiate Dictionary Fres·nel lens Pronunciation: ' frez-nəl-, frā- ' nel- Function: noun Etymology: Augustin J. Fresnel Date: 1865 : a lens that has a surface consisting of a concentric series of simple lens sections so that a thin lens with a short focal length and large diameter is possible and that is used especially for spotlights