直角镜 meaning in English

angle mirror
prism square
prismatic square

Comprises a cylindrical tube with two right angled eyepieces fitted in opposite directions . science in different viewing field can be observed at one end of the tube
两端带有相反方向的直角镜筒，在镜筒一端能观察到不在同一视野内的景物。
In addition , if your line of sight is perpendicular to the line of intersection between the mirrors , then no matter where you are , your image will always be visible as long as you can see the line of intersection ( note that the angle between the orthogonal mirrors must be accurate )
直角镜有一个有趣的特性，就是当你将直角镜转动时，镜像的转动角度会大一倍。此外，只要直角镜面相交线与视线垂直，无论你站在甚么地方，只要看到相交线，就可以看到自己的影像(要注意镜子的夹角必须准确) 。
In addition , if your line of sight is perpendicular to the line of intersection between the mirrors , then no matter where you are , your image will always be visible as long as you can see the line of intersection note that the angle between the orthogonal mirrors must be accurate
直角镜有一个有趣的特性，就是当你将直角镜转动时，镜像的转动角度会大一倍。此外，只要直角镜面相交线与视线垂直，无论你站在甚么地方，只要看到相交线，就可以看到自己的影像要注意镜子的夹角必须准确。