Question

Explain why white light is dispersed when passing through a prism.

Answer 1

The velocity of light in a material medium depends upon its colour (wavelength) i.e. the refractive index of a material is different for different colours. If we incident a ray of white light on a prism; on emergine, the different colours are deviated through different angles. Due to this, white light splits into its consituent colours and the phenomenon is called dispersion.

Answer 2

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Dispersion of Light' can be defined as the splitting of white light when it passes through a glass prism into its constituent spectrum of colors (i.e. violet, indigo, blue, green, yellow, orange and red).

The white light splits into its constituent colors at various frequencies and various angles.

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