Two parallel slits are illuminated with monochromaticlight of wavelength 500 nm.An interference pattern is formed on ascreen some distance from the slits, and the fourth dark band is located1.68 cm from the central bright band on the screen. (a) Whatis the path length difference corresponding to the fourth darkband? (b) What is the distance on the screen between the centralbright band and the first bright band on either side of the centralband? (Hint: The angle to the fourth dark band and the angle tothe first bright band are small enough that tan u = sin u.)

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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.