User:JinFX/help

$$O_0 P_2 + O_2 T_2 = \sqrt {(O_0 P_2)^2 + (O_2 T_2)^2 - 2 (O_0 P_2)(O_2 T_2) \cos \alpha }$$

$$|v_{1,i}|^2 = |v_{1,f}|^2+ |v_{2,f}|^2 \,$$

$$I = \rho [ \frac{1}{2} (r_1^2 + r_1^2) \pi h_1(r_2^2 - r_1^2) + \frac{2}{2} (r_1^2 + r_0^2) \pi h_1(r_1^2 - r_0^2)] $$

$$n_2= \frac{n_1 \sin \theta_1}{\sin \theta_2}$$