$A$ light ray is incident on a spherical glass surface at an angle $\alpha$ and is refracted at an angle $\beta$. What is the angle of deviation between the emergent ray and the incident ray?
- A$\left( {\alpha - \beta } \right)$
- B$2\left( {\alpha - \beta } \right)$
- C$\left( {\alpha - \beta } \right)/2$
- D$\left( {\alpha + \beta } \right)$
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