In Young's double-slit experiment,the distance between the two slits is $3 \, cm$,the distance from the slits to the screen is $7 \, cm$,and the wavelength of light used is $1000 \, \mathring{A}$. Calculate the fringe width.
- A$2 \times 10^{-5} \, m$
- B$2 \times 10^{-9} \, m$
- C$0.2 \times 10^{-6} \, m$
- D$2.3 \times 10^{-7} \, m$
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