$A$ double slit experiment is immersed in water of refractive index $1.33$. The slit separation is $1 \,mm$, and the distance between the slit and the screen is $1.33 \,m$. The slits are illuminated by light of wavelength $6300 \,Å$. The fringe width is:
- A$4.9 \times 10^{-4} \,m$
- B$5.8 \times 10^{-4} \,m$
- C$6.3 \times 10^{-4} \,m$
- D$8.6 \times 10^{-4} \,m$
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