$A$ ray of light is incident at an angle '$i$' on one face of a prism of small angle '$A$' and emerges normally from the other surface. If '$\mu$' is the refractive index of the material of the prism,then the angle of incidence is:
- A$A \mu$
- B$\frac{A}{2 \mu}$
- C$\frac{A \mu}{2}$
- D$\mu$
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