SELECT * FROM question_mgmt as q WHERE id=2738 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=8 AND chapterId=124 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)
(a) The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 × 10 8 m s -1 )
(b) Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?
(a) It is given that,
Refractive index of glass, μ = 1.5
We know, Speed of light, c = 3 × 10 8 m/s
So, speed of light in glass can be calculated by the relation, v= c/µ = 3x108 / 1.5 = 2x108
Hence, the speed of light in glass is 2 × 10 8 m/s.
(b) No, the refractive index and the speed of light in a medium depend on wavelength i.e. colour of light.
We know that μ v > μ r . Therefore, v voilet < v red . Hence voilet component of white light travels slower than the red component in a glass prism.
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