前透镜是由透镜和棱镜组合而成的散光玻璃，将反射镜反射出的平行光线折射，使车前路面和路缘均有很好的照明效果。
一百年前，爱因斯坦语言了一种宇宙重力透镜，这种透镜能够勾勒出宇宙中的的巨大星系。
A century ago, Einstein predicted an effect called cosmic gravitational lensing. Picture a massive galaxy out in space.
为了不使蓝光进入相机而成像，可在相机的透镜前加一黄滤色镜。
A yellow filter is placed in front of the camera lens to assure that no blue light will be imaged.
透镜状含金石英脉在平面上呈右行雁列排列与重叠侧幕排列，剖面上呈前侧式展布。
In the plane, lenticular gold-bearing quartz vein is arranged in echelon to the right row and overlapping side-curtain. In profile, it is pre-side spread.
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