Three discrete spectral lines occur at angles of 10.3°, 13.8°, and 15.0°, respectively, in the first-order spectrum of a diffraction grating spectrometer. (a) If the grating has 3780 slits/cm, what are the wavelengths of the light? ?1 = _________nm  (10.3 degrees) ?2 = _________nm (13.8 degrees) ?3 = _________nm (15.0 degrees) (b) At what angles are these lines found in the second-order spectra? ? = ______  (?1) ? = ______  (?2) ? = ______  (?3)

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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.