ICSE-X-Physics
06: Spectrum of Light
- #5Explain the cause of dispersion of white light through a prism.Ans : 5 When white light is incident on the first surface of a prism and enters in glass, light of different colours due to different speeds in glass, is refracted or deviated through different angles. Thus the dispersion of white light into its constituent colours takes place at the first surface of prism. Thus the cause of dispersion is the change in speed of light with wavelength or frequency.