What is the difference between resolving power and dispersive power of a grating?
Resolving power of grating is the quality of grating element in how clearly it can separate two close waves in the spectrum. Dispersive power of grating is defined by the ratio of change in angle of diffraction to the corresponding change in wavelength.
What is the resolving power of a diffraction grating?
Resolving Power: The resolving power of a grating is a measure of its ability to spatially separate two wavelengths. It is determined by applying the Rayleigh criteria to the diffraction maxima; two wavelengths are resolvable when the maxima of one wavelength coincides with the minima of the second wavelength.
What is dispersive power of a diffraction grating?
NUMERICAL PROBLEMS Page 3 27-08-2020 Side 3 Madan Mohan Malaviya Univ. of Technology, Gorakhpur ➢The dispersive power of a diffraction grating is defined as the rate of change of the angle of diffraction with the wavelength of light. ➢It is expressed as dθ/dλ.
What is a diffraction grating explain dispersive power and resolving power of plane diffraction grating?
The dispersive power of a grating is defined the ratio of the difference in angle of diffraction of any two neighbouring spectral lines to the diffraction in the wavelength between the two spectral lines. It is expressed as dθ/dλ We know (a+b) sinθ = nλ Differentiate with respect to λ
What is the formula of dispersive power?
If A is a small angled prism’s refractive angle and is the angle of deviation δ. The expression δv−δrδy is known as dispersive power of the material of the prism and is denoted by ω.
What is resolving power of grating derive an expression for the same?
Resolving power of grating is defined as the capacity to form separate maxima of two wavelength which are very close to each other. This is measured by λ/dλ where dλ is the smallest difference between two wavelengths an λ is mean wavelength.
What is resolution of grating?
If there are two spectrum lines corresponding to two neighboring wavelengths λ and λ+Δλ, the resolution is a measure of the extent to which Δλ can be reduced while still being able to distinguish between the lines.
What is the relation between dispersive power of a grating and the order and of a spectrum?
In equation (ii) dθ/dλ is the dispersive power, n is the order of the spectrum, N’ is the number of lines per cm of the grating surface and θ is the angle of diffraction for the n th order principal maximum of wavelength λ.
What is dispersive power and its formula?
Define Dispersive power Dispersive power of a prism is defined as the ratio of angular dispersion to mean deviation produced by prism. ω=δδv−δr=μ−1μv−μr.
What is dispersive power and formula?
Formula for dispersive power is (where symbols have their usual meanings) or. If the refractive indices of crown glass for red, yellow, and violet colours are respectively μr. , then the dispersive power of this glass would be. A. μv−μyμr−1.
What is the dispersive power?
Definition of dispersive power : the power of a transparent medium to separate different colors of light by refraction as measured by the difference in refractivity for two specified widely differing wavelengths divided by the refractivity at some specified intermediate wavelength.