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Explain the refraction of light through a glass prism. |
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Answer» Solution :(i) When a beam of white light or composite light is refracted through any transparent media such as glass or water, it is split into its component colours. This phenomenon is called as 'dispersion of light'. (ii) The band of colours is termed as spectrum. This spectrum consists of following colours: Violet , Indigo, Blue , Green , Yellow, ORANGE , and Red. These colours are represented by the acronym "VIBGYOR". (iii) When white light is refracted by a transparent medium, different angles. That is the angle of refraction is different for different colours. (IV) Angle of refraction is the smallest for red and the highest for violet. (v) From Snell's law, we know that the angle of refraction is DETERMINED in term of the REFRACTIVE index of the medium. (vi) hence, the refractive index of the medium is different for different coloured lights. |
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