When white light is passed through glass prism, the dispersion occurs because

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Colors of white light travels at same speeds through prism.

Colors of white light travels at different acceleration through prism.

Colors of white light travels at different speeds through prism.

None of these

answer is A.

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Detailed Solution

When a light ray moves from one medium to another at an angle and its speed alters, it is refracted (bent). If the substance it enters is denser (when light slows down), it is bent in one direction at the contact, and in the other direction if the material is less dense (when light speeds up).
The amount of bending varies for various wavelengths because different light wavelengths (colors) go through a material at various rates.
Because violet light has a shorter wavelength than red light and shorter wavelengths go through a medium more slowly, violet light is bent the most, and red light the least.
White light contains all visible wavelengths, therefore this variation in behavior allows its colors to be distinguished (dispersed).

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