![]() ![]() This means angles on the opposite side of the normal will be negative.Ī monochromatic light is a term given to a light of single color more particularly having rays of single wavelength while polychromatic define the light having multiple wavelengths. anticlockwise angles are taken in positive while those clockwise are taken as negative away from the normal. The sign convention of the angels follows the traditional way, i.e. The path difference of the rays should be the integral wavelength of their wavelength, i.e.Ībove written is the basic grating equation, where ‘n’ denotes order of diffraction. Now, if I denote angle of incidence and D denotes angle of diffraction, then according to Bragg’s law, Both the angle of incidence and the angle of diffraction are measured from the normal of the groove taken perpendicular to its surface. ![]() This property eventually leads to constructive interference. ![]() Whenever a ray of light is diffracted from a groove, it is in phase with the one diffracted by some other groove for a fixed set of angles (decided by the order). The figure below shows a reflection plane grating (few of them are also of transmission type) with two light rays being incident on it. Even two most crucial features for defining a grating are its grooves’ quality and spacing. The way grooves are being cut and machined directly affects the performance of the grating. Diffraction gratings with parallel grooves are said to be plane diffraction grating. An optical material is used as the substrate for the diffraction grating on which grooves are being cut either parallel or curved. There are various methods for manufacturing diffraction grating like the one by direct ruling or by replicating master gratings. ![]()
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