A double slit aperture is illuminated with HeNe laser light (λ = 638 nm).  The pattern observed on a screen placed 2.5 m from the aperture is shown below.  If the distance between the 2nd order minima on either side of the central bright spot is 25 cm, determine the spacing between the slits.  (determine m for 2nd order minima.)

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Q: the third-

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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.