What is the value of dispersive power of grating?

From equation (ii), it is clear, that the dispersive power of the grating is (1) directly proportional to the number of lines per cm and (3) inversely proportional to cos θ. Thus, the angular spacing of any two spectral lines is double in the second order spectrum in comparison to the first order.

What is dispersive power of diffraction grating?

Dispersive power of plane diffraction grating: The dispersive power of a diffraction grating is defined as: The rate of change of the angle of diffraction with the change in the wavelength of light are called dispersive power of plane grating.

What is dispersive power of plane transmission 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

What is the relation between the dispersive power D of a grating and the grating element B D?

What is the relation between the dispersive power, D, of a grating and the order, n, of a spectrum? Thus, as we can see D ∝ n. Hence, higher the order, higher is the dispersive power.

What is the formula of dispersive power?

The expression δv−δrδy is known as dispersive power of the material of the prism and is denoted by ω. The ratio of angular dispersion for any two wavelengths to the deviation of mean wavelength is the dispersive power of a prism’s material. The SI unit of dispersive power is watt.

What is plane diffraction grating?

A large number of narrow rectangular slits having width in the order of the wave length of light and arranged side by side with equal opaque spaces is called a plane transmission diffraction grating. It is an extension of diffraction due to double slit.

On what factors does dispersive power of a grating depend?

Answer: It depends only on the refractive index of the prism and is independent of the shape and size of the prism. Answer: It depends only on the refractive index of the prism and is independent of the shape and size of the prism.

What is dispersive power and resolving power?

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.

How is dispersive power related to refractive index of the material?

Angular dispersion and dispersive power; Here df is the change in focal length and dμ is the corresponding change in the refractive index of the material of the lens. The dispersive power for a small angle prism is defined as the ratio of the angular dispersion to the deviation produced by it to mean light.

What is the resolving power of 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.

Does dispersive power increase with angle of diffraction?

❖ Dispersive power is inversely proportional to cos θ, i.e. larger the value of θ higher is the dispersive power. to produce distinctly separate spectral lines of light having two or more close wavelengths.