Beams of light are incident through the holes $A$ and $B$ and emerge out of the box through the holes $C$ and $D$ respectively,as shown in the figure. Which of the following could be inside the box?

  • A
    $A$ convex lens
  • B
    $A$ rectangular glass slab
  • C
    $A$ concave lens
  • D
    $A$ prism

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