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| Q. |
"Tice splitting of different colours of light in a prism is : |
| A. | Reflection of light |
| B. | Dispersion light |
| C. | Diffraction light |
| D. | Refraction of light |
| Answer» B. Dispersion light | |
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Explanation: The refractive index of many materials (such as glass) varies with the wavelength or colour of the light used, a phenomenon known as dispersion. This causes light of different colours to be refracted differently and to leave the prism at different angles, creating an effect similar to a rainbow. In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency, or alternatively when the group velocity depends on the frequency. |
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