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Q.

Which of the following colours of white light has the maximum speed in the glass prism?


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a

Red

b

Blue

c

Violet

d

Black   

answer is A.

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Detailed Solution

Red colour has the maximum speed in the glass prism.
The velocity of light is given by v= f x λ 
Where f is the frequency and λ is the wavelength.
When travelling through a medium, the frequency remains unchanged, and hence, speed depends upon the wavelength of light. Red colour has the longest wavelength among VIBGYOR. So, the red colour has the maximum speed in a glass prism. Thus, the refractive index property for red will be minimum.
                                                                                                     


           


       


         


       


      


          


        


      


      


     


      


     
                                                                                                                                                                                                                                       
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