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The slits in a double-slit interference experiment are illuminated by orange light $(\lambda  = 600\  nm)$. A thin transparent plastic of thickness $t$ is placed in front of one of the slits. The number of fringes $(N)$ shifting on screen is plotted versus the refractive index $μ$ of the plastic in graph shown. The value of $t$ is

• A
  $4.8\  mm$
• B
  $48\  μm$
• C
  $2.4\  μ\ m$
• ✓
  $24\  μm$