Resolving power of a grating

November 28, 2021
(a) Graph of intensity of the

Resolving PowerThis article has been authored by Prashant Sharma, a Technology Columnist-Engineer by Profession who has scripted a cluster of Utility focussed and simplistic write-ups relating to Physics out here.His fundamental striking articles at XAmplified are easy-to-understand and helpful enough for Physics-phobic folks

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The two point sources or two spectral lines of equal intensity are said to be ‘Resolved’ when the central maximum of the diffraction pattern due to one source falls on the first minimum of the diffraction pattern of the other source.

Concept Description

Let 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, Resolving power of Grating

Let nth principal maxima of wavelength be formed in the direction, we have.

Let the first minima adjacent to the nth maxima be formed in the direction . Then form the grating equation of minima, we have

Clearly the first minima adjacent to nth principal maxima in direction increasing will be obtained if M = nN + 1.

According to Rayleigh’s criterion, two spectral lines of wavelength λ and λ + dλ are just resolved when nth maxima of wavelength λ + dλ falls on first minima of wavelength λ + dλ adjacent to its nth maxim. For nth maxima of wavelength λ, we have

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