![]() ![]() You can choose the color and see what the index is for that wavelength. The simulation below is for visible light passing through a prism. There is not much dispersion for sound waves in air but acoustic waves in solids do experience significant dispersion. For example, longer wavelength surface waves on the ocean travel faster than shorter wavelength waves. Dispersion of light Back to Solutions Chapter List Chapters 1. ![]() The change of wave speed as a function of wavelength is called dispersion and occurs for all types of waves. ![]() This is in fact how a prism and water droplets separate colors and why good camera lenses (which compensate for this effect by using compound lenses) are expensive. However if the sides are not parallel, such as a prism or lens, there will be a separation of color. If the sides of the medium are parallel, each color unbends by the same amount that it bent going into the medium so all the colors are again going in the same direction. So if we start with several different wavelengths (different colors) we expect there may be some situations in which the colors will separate. This is not true the index of refraction changes slightly for different wavelengths. In the previous simulations on refraction we assumed that all wavelengths bend by the same amount. The dispersion phenomenon demonstrated with the help of plastic rulers improves if the ruler is not coloured.\) When such a ruler is held at a particular angle and is exposed to white light, it tends to produce a spectrum of light as a result. A plastic ruler is generally translucent in nature. Plastic rulers are one of the most common examples of objects present in our real life that are capable of exhibiting the dispersion phenomenon. The bending of light demonstrates the phenomenon of refraction of light in real life. The output light obtained as a result is slightly bent in nature. When a ray of white light is made to strike the surface of a prism, it gets split into a spectrum of light. The dispersion phenomenon exhibited by the soap bubbles can be verified easily by observing the colourful spectrum of light that gets formed over its surface when light falls on its surface.Ī prism is a piece of laboratory equipment made up of glass or silicon that is generally used to display the existence of dispersion phenomenon in real life. When a ray of light from the sun or any other source of light falls on the surface of the oil that is spilt on the water surface, a pattern of coloured light due to the dispersion phenomenon gets formed that can be observed easily with naked eyes. Petroleum has a low density as compared to water, which is why it tends to rest over the water surface. Petroleum and water are immiscible liquids. The existence or the formation of this coloured pattern on the surface of the disk is a prominent example of the dispersion phenomenon in real life. DISPERSION OF LIGHT The splitting up of white light into seven colours on passing through a transparent medium like a glass prism is called dispersion of light. If you hold a compact disk in hand with its mirror face facing towards the light source, you can easily observe a multicoloured pattern that gets formed on its surface. ![]() When sunlight passes through a glass prism, he discovered that white light is made up of seven distinct hues. Sir Isaac Newton described this occurrence in 1666 A.D. The water droplets here, tend to work as a prism and are used to split the ray of light into seven distinct colours with the help of the dispersion phenomenon.Ĭompact disks are readable and writeable data storage devices. Dispersion of Light When light passes through a transparent medium, dispersion is defined as the splitting of the light beam into its seven constituent colours. Rainbows are formed when the rays of sunlight pass through the tiny water droplets or vapours present in the environment during or after rain. Dispersion of Light Examples in Daily Lifeĭispersion of Light Examples in Daily Life 1. ![]()
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