一个用VC++6.0编的光学小程序源代码。已知玻璃折射率，透镜厚度，两边曲率，用来计算单透镜的主平面的像方焦点。-A used VC++ 6.0 allocated small optical source code. Known refractive index of glass, lens thickness, on both sides of curvature, used to calculate the single-lens plane as the main focus side.