The graph between angle of deviation ($$\delta$$) and angle of incidence ($$i$$) for a triangular prism is represented by :

For a triangular prism, the angle of deviation ($$\delta$$) depends on the angle of incidence ($$i$$) according to the relation: $$\delta = i + e - A$$

Where $$e$$ is the angle of emergence and $$A$$ is the angle of the prism.

As the angle of incidence ($$i$$) increases, the angle of deviation ($$\delta$$) initially decreases, reaches a minimum value, and then increases.

 There is one unique angle of incidence at which the deviation is minimum. At this point, the angle of incidence equals the angle of emergence ($$i = e$$).

The relationship is non-linear, resulting in a continuous, asymmetrical curve that opens upwards.

Conclusion: The graph showing a clear minimum point followed by an upward trend correctly represents the $$\delta - i$$ characteristics of a prism.

Correct Option: (A)