$A$ ray of light passes through four transparent media with refractive indices $\mu_1$,$\mu_2$,$\mu_3$,and $\mu_4$ as shown in the figure. The surfaces of all media are parallel. If the emergent ray $CD$ is parallel to the incident ray $AB$,we must have
- A$\mu_1 = \mu_2$
- B$\mu_2 = \mu_3$
- C$\mu_3 = \mu_4$
- D$\mu_4 = \mu_1$
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