Dispersion is due to

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Wavelength

Intensity of light

Density of light

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Detailed Solution

Dispersion is due to wavelength.
Dispersion is the term used to describe how white light disperses into its whole spectrum of wavelengths. Technically speaking, dispersion occurs whenever the wavelength of light affects how it propagates.
The change of the light ray's speed, which creates a different angle of deflection for each wavelength, is what causes the dispersion of light. The figure explains how a prism disperses a light wave.[3][4]
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The relationship between a wave's speed and wavelength in any medium causes dispersion.

v \propto λ

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As white light travels through a glass prism, its individual colours—red, orange, yellow, green, blue, indigo, and violet—move through the prism at various speeds because the refractive[5][6] index is colour-dependent. Due to this, light is dispersed.[7][8]

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