Double-Slit Interference: Coherent light of wavelength 575 nm falls on a double-slit and the third-order bright fringe is seen at an angle of 6.5° away from the centerline. How far apart are the double slits?
A. 5.0 ?m
B. 10 ?m
C. 15 ?m
D. 20 ?m
Answer: C
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