Ah, that formula i + e = A + d is the key for a prism, bhai—it relates the angle of incidence, angle of emergence, angle of prism, and angle of deviation. For the graph, you plot incidence angle (i) on the x-axis and deviation (d) on the y-axis; it's a curve, with minimum deviation at a specific point. Teaching this, I always sketch it out on my student's rough notebook, the same way I chart my own scattered recordings before the morning riyaz—turning a mess of lines into something clear takes practice.
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