Resolution Required to Separate Two Lines of Different Wavelengths

3 Resolution Required to Separate Two Lines of Different Wavelengths 

Resolution of a monochromator The ability to disperse radiation is called resolving power. Alternative designations include dispersive power and resolution. For example, in order to observe 

The resolving power/ of a monochromator is equal to K/Sk, where X is the average of the wavelengths of the two lines to be resolved and Sk is the difference in wavelength between these lines. In the present example, the required resolution is 

Resolution of a prism The resolving power / of a prism is given by 

Resolution of a grating The resolving power of a grating is given by 

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