Both the ray path formula and the inversionformula are very simple.
射线路径公式和反演公式都很简单。
2
Then we prove the isometrical identity and inversionformula of the solution of the wave equation.
得到了波动方程的解的反演公式及等距等式，为再生核理论的应用提供了新的思路。
3
In order to study laser propagation in inhomogeneous medium, Collins formula was improved by using time inversion characteristic of optic phase conjugation wave.