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What is diffraction grating and grating element? Explain the experimental method to determine the wavelength of the spectral line using diffraction grating?
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Diffraction grating:

A diffraction grating is an arrangement consisting of a large number of parallel slits of same width and separated by equal opaque spacing. It is obtained by ruling equidistant parallel lines on a glass plate with the help of a fine diamond point.

Grating element:

Let N be …

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