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Question
Using the curve, how do you infer that for given prism, the angle of minimum deviation δmin is unique for the given light?
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Solution
In the position of minimum deviation δ = δmin,
i1 = i2 = i (say)
Where i1 is angle of incidence and i2 is angle of emergence.
Then δmin = 2i - A
For given prism and given colour of light, δmin is unique.
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