A diffraction grating is 3 cm long and has 3000 slits. White light shines through it and creates fringes on a screen 0.7 m away. The first fringe of the color pewter appears 3.4 cm from the central white fringe. What wavelength is this pewter light (in nanometers, nm)

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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.