Explain centers of the central band and the first-order band, Physics

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A physics student performs a double-slit diffraction experiment on an optical bench, as shown in the figure below.

The light from a helium-neon laser has a wavelength of 632.8 nm.

The laser light passes through two slits divided by 0.020 mm. What is the distance among the centers of the central band and the first-order band?

 


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