A Young's double slit experiment apparatus has slits separated by $0.2 \mathrm{mm}$ and a screen $60 \mathrm{cm}$ away from the slits. The whole apparatus is immersed in a liquid medium of refractive index $\frac{11}{9}$ and the slits are illuminated with green light ($\lambda =550 \mathrm{nm}$ in vacuum). Find the fringe width of the pattern formed on the screen.

• A

  $0.95\mathrm{mm}$
• B

  $1.25\mathrm{mm}$
• Correct answer
  C

  $1.35\mathrm{mm}$
• D

  $1.45\mathrm{mm}$

Hence, the correct answer is option: 'C'.