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A thin glass plate of thickness is $\frac{{2500}}{3}\,\lambda $ ($\lambda $ is wavelength of light used) and refractive index $\mu  = 1.5$ is inserted between one of the slits and the screen in Young's double slit experiment. At a point on the screen equidistant from the slits, the ratio of the intensities before and after the introduction of the glass plate is

• A
  $2:1$
• B
  $1:4$
• ✓
  $4:1$
• D
  $4:3$