For a small angled prism with prism angle $A$,the angle of minimum deviation $(\delta_m)$ varies with the refractive index $(\mu)$ of the prism as shown in the graph.

  • A
    Point $P$ corresponds to $\mu = 1$.
  • B
    Slope of the line $PQ = A/2$.
  • C
    Slope of the line $PQ = A$.
  • D
    Both $(a)$ and $(c)$.

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