Question

What is the cause of dispersion of white light passing through a glass prism?

Answer 1

Dispersion of white light passing through a glass prism is due to the difference in their velocity in different medium.

Answer 2

When a white light pass through a glass prism it scatter into 7 spectrum of light after refraction .

As all the colour have different wavelength and intensity . So according to their wavelengths they scatter at different angles of deviation causing dispersion of light