Light of wavelength 300 nm in medium A enters into medium B through a plane surface. If the frequency of light is 5 × 10 14 Hz and the ratio of speed in medium A to that is medium B is 4 5 , the absolute refractive index of medium B is,

Question

Light of wavelength 300 nm in medium A enters into medium B through a plane surface. If the frequency of light is 5 × 10 14 Hz and the ratio of speed in medium A to that is medium B is 4 5 , the absolute refractive index of medium B is,, 1.6, 1.5, 1.3, 1.45

MARKS App · Accepted Answer

Absolute refractive index of medium A, μ A = c ν A λ = 3 × 10 8 5 × 10 14 × 300 × 10 - 9 = 2 Refractive index is inversely proportional to the velocity of light. ⇒ μ B μ A = v A v B = 4 5 ⇒ μ B = μ A 4 5 = 8 5 ⇒ μ B = 1 . 6

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