Q.No.128(c): - Describe the dispersion phenomenon. Or What is the microscopic reason of dispersion? Or Describe the dispersion on atomic scale. Ans: - The electric field of the incident field of the incident light causes the electron in an atom to oscillate with the frequency of the incident light. When the incident and scattered waves interfere then the phase of their combination depends on their phase difference and hence on the frequency. As a result, the speed of light in a material depends on the frequency or wavelength. This phenomenon is called dispersion.

Q.No.128(c): -Describe the dispersion on atomic scale.

Ans: - The electric field of the incident light causes the electron in an atom to oscillate with the frequency of the incident light. When the incident and scattered waves interfere then the phase of their combination depends on their phase difference and hence on the frequency. As a result, the speed of light in a material depends on the frequency or wavelength. This phenomenon is called dispersion.