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Q.

Which of the following colors of white light has the least speed in the glass prism?


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a

Red

b

Blue

c

Violet

d

Black   

answer is C.

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Detailed Solution

Violet colour has the least 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. Violet colour has the shortest wavelength among VIBGYOR. So, the violet colour has the minimum speed in a glass prism. Thus, the refractive index property for violet will be maximum.
 
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