Two narrow slits separated by 0.400 mm are illuminated by a sodium vapor light with a 589 nm wavelength.  A screen set 3.00 m away is used to observe interference fringes.  Determine the distance between the central maximum and the third bright fringe. a. 13.26 mm b. 15.47 mm c. 8.84 mm d. 11.05 mm

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.