NCERT Class XII Chapter
Wave Optics
Questions With Solutions
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Question : 3
Total: 21
(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?
(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?
Solution:
(a) Speed of light in glass, v =
10 8 m s − 1
(b) Yes, speed of light in glass depends upon the colour of light (i.e., λ).
Thus, speed of light is different for red and violet colours.
Asµ V µ R l V l R v V v R
Speed of red colour is more than violet colour light in glass
(b) Yes, speed of light in glass depends upon the colour of light (i.e., λ).
Thus, speed of light is different for red and violet colours.
As
Speed of red colour is more than violet colour light in glass
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