A "diffraction" grating is made up of slits of width 310nm with a 930nm separation between centers. The grating is illuminated by monochromatic plane waves, λ=615nm, with the angle of incidence zero. (a) How many diffraction (or interference if you prefer that nomenclature) maxima are there? (b) Find the width of the spectral lines observed in the first order if the grating has 1120 slits

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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.