The angle of deviation $\delta$ produced by a prism of refractive index $\mu$ and small refracting angle $A$ is given by:
- A$\delta = (\mu - 1) A$
- B$\delta = (\mu + 1) A$
- C$\delta = (A - 1)$
- D$\delta = (A + 1) \mu$
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