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ICSE Class 10 Answered

Why is the speed of red light fastest in any medium except air
Asked by lovemaan5500 | 29 Jan, 2018, 08:30: PM
answered-by-expert Expert Answer
refractive index of red color light is less than the refractive index of violet light in given medium. For example in glass, refractive index of red color light is 1.513  and refractive index of violet light is 1.532. As per hygene's wave theory, due to its longer wavelength, more refraction taking place in the refracting medium for red color light that gives rise to less refractive index for the given angle of incidence. Speed of light in air/vaccuum and speed of light in a refracting medium like glass are related to refractive index of medium as given below
 
c / v = μ
where v is speed of light in refracting medium, c is speed of light in air and μ is refractive index of medium. As can be seen from this relation that if refractive index is less means speed of light in medium is more.
Answered by Thiyagarajan K | 30 Jan, 2018, 11:28: AM
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