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Consider the central peak in the diffraction envelope in the figure below. Suppose the wavelength of the light is changed to 450 nm. What happens to this central peak?
a) The width of the peak decreases and the number of interference fringes it encloses remains the same.
b) The width of the peak increases, and the number of interference fringes it encloses increases.
c)The width of the peak increases, and the number of interference fringes it encloses decreases.
d) The width of the peak decreases, and the number of interference fringes it encloses increases.
e) The width of the peak increases, and the number of interference fringes it encloses remains the same.
f) The width of the peak decreases, and the number of interference fringes it encloses decreases.

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