DISPERSION: The splitting of white light into different colours (VIBGYOR) is called Dispersion . When a white light is sent through a prism with some angle with the surface, it splits into seven different colours. We can consider that white light is a collection of waves with different wavelengths. Violet colour is known to have the shortest wavelength while red is of the longest wavelength. According to wave theory, light can be thought of a wave propagating in all directions. Light is an electromagnetic wave. Here no particle physically oscillates back and forth. Instead, the magnitude of electric and magnetic fields, associated with the electromagnetic wave, vary periodically at every point. These oscillating electric and magnetic fields propagate in all directions with the speed of light. The reason lies in the fact that, while the speed of light is constant in vacuum for all colour...
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