18. In a double-slit experiment, the wavelength λ of the light source is 520 nm, the slit separation d is 25 µm, and the slit width a is 5 µm. Consider both the interference of the light from the two slits and the diffraction of the light through each slit. How many bright interference fringes are within the central peak of the diffraction envelope?
(A) 9
(B) 10
(C) 11
(D) 12
(E) 13

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