The formation of a rainbow is also an example of dispersion. Holograms and CD which reflects the rainbow colors are due to diffraction When white light travels through the prism, the white light disperses into seven colors of a different wavelength. Examples A diffraction grating is the best example of the diffraction of white light. The dispersion of the light takes place when the light travels from a denser medium to a rarer medium or vice versa of different refractive indices. T he Refractive index of the propagating medium is the leading cause of the dispersion. Refractive indices of the medium Since diffraction depends on the wavelength and frequency of the incident light, which depends on the refractive index of the medium, thus diffraction also depends on the refractive indices of the medium of propagation. Dispersion entirely depends on the angle of minimum deviation. If we are using white light for the diffraction process, it depends on the angle of deviation. Dependency on the angle of deviation Diffraction is independent of the angle of deviation of the light if the monochromatic light is used for the diffraction process. We do not see the dispersion of waves in monochromatic light. Dispersion can be achieved only by using white light or polychromatic light. We get diffraction fringes of seven colors in the polychromatic, i.e., using white light and fringes of dark and bright by using the monochromatic light. Monochromaticity The diffraction can be obtained using both monochromatic and polychromatic light. There will be a change in the velocity of the incident light as the light is travelling between the two mediums of different refractive indices. The velocity of the light The velocity of the light before and after diffraction of light remains constant, i.e., diffraction does not affect the velocity. The light with a shorter wavelength disperse first, and then, in increasing order, they spread out of the medium. The spreading up of light waves depends on their wavelength. Dependency on wavelength Diffraction depends on the wavelength of the incident light, as if the light wave of longer wavelength is incident on the slit, it diffracts more. The propagation of light waves from one medium to another medium of different refractive indices splits into different wavelengths. Diffraction Dispersion Definition When the light strikes the edge of the hurdle, it bends at the corner, creating the geometrical fringes. The table given below helps you to understand the differences and also similarities between diffraction vs dispersion. In this post, we give a brief comparison of diffraction vs dispersion of light and their behavior. Both terms sound similar, but there are certain natures that differ them from one another. The light wave has the ability to bend and then spread out itself this behavior of light can be distinguished as diffraction and dispersion. In optics, the study of diffraction and dispersion helps us understand the behavior of light, such as the bending and spreading of light when it passes through a medium.
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