A diffraction grating is an optical device composed of several parallel, closely spaced slits, used to produce diffraction patterns of the interference of light waves. When light is shone through the grating, it produces multiple diffraction patterns, consisting of bright and dark fringes, which are separated by a distance. Increasing the distance between the slits (d) causes the bright fringes to move farther apart. This is because the distance between the slits determines the spacing of the diffraction fringes, and increasing the distance will cause the fringes to move farther away from each other. As the distance increases, the fringes become narrower, as the light waves spread out and become weaker. This is because the increased distance between the slits allows more of the light to spread out, which results in thinner fringes.
In an experiment with a diffraction grating, if we increase the distance between the slits d, the bright fringes move farther apart. This is because the spacing between the bright fringes is directly proportional to the distance between the slits (d).Diffraction gratingDiffraction grating is an optical element that disperses white light into a spectrum of colors. It is a plane piece of glass or transparent plastic that is coated with thousands of parallel grooves that act as slits that allow light to diffract.In a diffraction grating, the bright fringes result from constructive interference between the waves of light that pass through the slits. When the distance between the slits is increased, the angle of diffraction decreases, and the distance between the bright fringes also increases.As a result, option B is the correct answer. The bright fringes move farther apart if the distance between the slits is increased.