Resolving and dispersive power of grating

Resolving power of grating is the  quality of grating element in how clearly it can separate two close waves in the spectrum.

Resolving power of grating is  clip_image001

Dispersive power of grating is defined by the ratio of change in angle of diffraction to corresponding change in wave length.

dispersive power of grating is given by clip_image001[6]

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