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The angular width of the central fringe of the interference pattern of 5 slits separated by...

The angular width of the central fringe of the interference pattern of 5 slits separated by d=4.0 micrometers with a wavelength of 20 micrometers is 0.01 radians. Each slit has a width of a=2 micrometers. The angular width of the central diffraction peak is 0.1 radians. How many interference fringes appear under the central diffraction peak? The correct answer is 15, but I'm not sure how to get there.

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