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 
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]](https://mohamedvakkayil.files.wordpress.com/2011/05/clip_image0016.png "clip_image001[6]"){kind=small}
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Physically “The capacity of spreading of the diffraction line of grating is called it’s dispersive power”
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