The paths of incidence and reflection are in a planenormal to the surface.
入射和反射的路径都在与表面垂直的平面内。
2
You can imagine superimposing a sphere on the image above, and then taking a planenormal to the point of interest.
你可以想象叠加就上述领域的形象,然后以正常的飞机的兴趣点。
3
A comprehensive study of free vibration, buckling and bending of anisotropic simply-supported skew plates subjected to in-planenormal and shear forces is conducted.