What is dispersion of light ? What is the cause of dispersion ?

 

Solution

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Dispersion of Light: The phenomenon of splitting white light into seven colors when it passes through a glass prism is called dispersion of light. 

Cause of Dispersion: When white light passes through a glass prism, its constituent colors (red, orange, yellow, green, blue, indigo, violet) travel with different speeds in the prism because the refractive index is color dependent. This causes the dispersion of light.