How does a Grating spectrum differ from a Prismatic spectrum?
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In the prism spectrum, the spectrum is formed due to the dispersion of light. But in the grating spectra it is due to the diffraction of light. ... In the prism spectra red having the highest wavelength and closer to the direct ray but in the grating spectra, the violet has highest wavelength as it near to the direct ray.
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The prism and diffraction grating are typical dispersive elements. ... The prism achieves dispersion due to the difference in the material refractive index according to the wavelength. However, the diffraction grating uses the difference in diffraction direction for each wavelength due to interference.
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