A graph is plotted between angle of deviation | vedclass

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Question

(A) For a prism,the relationship between the angle of deviation $(\delta)$ and the angle of incidence $(i)$ is given by the formula $\delta = (i + e)

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(A) For a prism,the relationship between the angle of deviation $(\delta)$ and the angle of incidence $(i)$ is given by the formula $\delta = (i + e) - A$,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.It reaches a minimum value known as the angle of minimum deviation $(\delta_m)$ at a specific angle of incidence.After this point,as the angle of incidence $(i)$ continues to increase,the angle of deviation $(\delta)$ starts to increase again.Therefore,the graph between $\delta$ and $i$ is a parabolic-like curve that shows a minimum,which corresponds to the graph shown in option $A$.

$A$ graph is plotted between angle of deviation $(\delta)$ and angle of incidence $(i)$ for a prism. The nearly correct graph is

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