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Two prisms make a cube as shown in in the picture.The first prism has a refraction index $\mu_1=1.5$ and the second prism has a unknown refraction index $\mu_2$.Light enters the cube perpendicular and leaves the cube parallel to the other side.Find the equation of $\mu_2$.
(The equation may be complicated.Just find the equation that can be solved to find $\mu_2$ )