$A$ beam of monochromatic light is incident at $i = 50^{\circ}$ on one face of an equilateral prism. If the angle of emergence is $e = 40^{\circ}$,then the angle of minimum deviation is:

  • A
    $30^{\circ}$
  • B
    $< 30^{\circ}$
  • C
    $\leq 30^{\circ}$
  • D
    $\geq 30^{\circ}$

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