[单选题]
Light of wavelength 575kz) 4x hqx3wl+ nm falls on a d h mow*8ulfj936-*mk4v/egzu jy2cw vouble-slit and the third order bright fringe is2uozwc9 86- jv3lhwv**y jg/ef4mmk u seen at an angle of $6.5^{\circ}$. What is the separation between the double slits?
A. $5.0 \; mm$
B. $10 \; mm$
C. $15 \; mm$
D. $20 \; mm$
