Still images from movies recorded at 4x optical magnification .

记录影片里4倍光学放大的静态图片。

Atmospheric optical phenomena can play with your mind at times .

有时，大气的光学现象会使你头脑产生这样的看法。

Many laser printers use an optical sensor to measure toner levels .

一些激光打印机使用光学感应传感器来测量墨粉余量。

They are giant optical illusions conceived by german artist edgar mueller .

它们是德国艺术家埃德加穆勒构想的巨大光学错觉。

Whatever optical tweaks correct the beam will also focus a telescope .

无论光学扭动怎么纠正，光束都将到集中到望远镜。