2016年1月5日,“高分四号”卫星发来了拍摄的第一张照片.“高分四号”卫星(如图1)位于地球上空3.6×10~4km外,它的一张照片能装下整个河南省.“高分四号”卫星的镜头相当于一个凸透镜还是凹透镜呢?透镜分为凸透镜和凹透镜,我们怎样辨别它们呢?根据形状辨别可以根据透镜的形状辨别某透镜是凸透镜还是凹透镜.中间厚、边缘薄的透镜是凸透镜,如图2中 On January 5, 2016, the first photo taken by “Highscores IV” satellites was sent. “The Highscores IV satellite (Figure 1) is located 3.6 × 10 ~ 4km above the Earth, A picture of it can hold the entire Henan Province. ”High score four " satellite lens is equivalent to a convex lens or concave lens? Lens is divided into convex and concave lens, how do we distinguish them? According to the shape of the lens can be identified according to The shape of the lens to distinguish whether a lens is a convex lens or concave lens middle thick edge thin lens is convex lens, as shown in Figure 2