Read the passage below and answer the following question <br><br>
The phenomenon of splitting of white light into its component colours on passing through a refracting medium such a glass prism is called dispersion of light. The pattern obtained on the screen is called spectrum. <br><br>
Cause for dispersion of light : Light rays of different colours travel with the same speed in vaccum. But in a refracting media like glss, water, etc; lights of different colours travel with different speeds. The speed of violet colour is the least while the speed of the red is the largest in glass. Hence the violet colour is deviated the most and the red colour the least. The other colur indigo, blue, green, yellow and orange are deviated by intermediate angles. <br><br>
Question : The refractive index for violet is what is the electric charge
