Resolving Power Derivation 1

Resolving Power

The two point sources or two spectral lines of equal intensity are just resolved by a optical instrument when the central maximum of the diffraction pattern due to one falls on the first minimum of the diffraction pattern of the other.
A a parallel beam of light of wavelength λ and λ + dλ be incident, normally on a plane transmission grating element (a + b) and total number of rulings 'N'. Let the diffracted beam be received by the telescope objective L. the total width is N (a + b) and total aperture of telescope objective is....

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