A student performs a double-slit interference experiment. The student records the  fact that a third-order dark spot is located at an angle of 20.11o for a given  light source. The wavelength of light is then decreased by 40.0nm, and the student  records the fact that the second-order dark spot is now located at an angle of  11.17o. What is the slit separation?

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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.