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Question 3: NCERT Solutions for 12th Class Physics: Chapter 10-Wave Optics

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Question 3: NCERT Solutions for 12th Class Physics: Chapter 10-Wave Optics

(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 × 108 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?

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  1. Solution:
    (a) Speed of 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 µv > µR so, λv < λR hence, υv < υR Speed of red colour is more than violet colour light in glass.

    Check the complete chapter with solutions.

    NCERT Solutions for 12th Class Physics: Chapter 10-Wave Optics