concave lens

基本解釋

Just as a double convex lens enlarges so a double concave lens reduces.
正象雙凸透鏡可以放大那樣，雙凹透鏡也可以縮小。
The invention provides a method with a concave lens focus as a welding heat source and a welding device thereof.
本發(fā)明提供一種以凸透鏡焦點為焊接熱源的方法及其焊接裝置。
ip.com
Among the reshaping systems converting a Gaussian beam to a flattop beam, the system composed of a plane-concave and a plane-convex lens, is a relatively simple structure.
在將高斯光束整形為平頂光束的整形系統(tǒng)中，由兩個非球面鏡組成的系統(tǒng)是比較簡單的結(jié)構(gòu)形式，該系統(tǒng)由平凹鏡和平凸鏡組成。

凹透鏡
The minimum degree of concave lens induced myopia was lens-4D,and eminimum degree of convex lens induced hypermetropic eyes+4 D.3.
2.本實驗誘導幼齡豚鼠形成近視的最小凹透鏡度數(shù)為—4D,可以誘導幼齡豚鼠形成遠視的最小凸透鏡度數(shù)為+4D。
凹球鏡片