Understanding Light Scattering and Its Applications
Explore the concept of light scattering, its types, and examples in various natural phenomena such as the blue sky and ocean color. Learn about the Raman Effect and its applications in molecular structure analysis. Understand the differences between Raman Spectra and IR Spectra in a comparative study.
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Presentation Transcript
SCATTERING OF LIGHT Deekshitha U G Assistant Professor Dept.of Physics
Introduction: Light scattering is a form of scattering in which light in the form of propagating energy is scattered Irregularities on the surface of the media is considered to be scattering of light There is no scattering in homogenous medium
Examples for scattering of light Objects are seen generally by scattering of light White colour of milk due to scattering White colour of sky due to scattering
Types of Scattering 1. Coherent scattering: The scattering in which the wavelength of the scattered light is same as that of the incident light 2. Incoherent scattering: The scattering in which the wavelength of the scattered light is different from that of the incident light
Why sky looks blue ? Due to sunlight by the air molecule in the atmosphere scattering of Rayleigh
The blue colour of the ocean is due to the reflected colour of the sky The red colour of the sky at sunrise and sunset is due to Rayleigh scattering
Application of Raman Effect: 1.Raman effect and molecular structure 2.Raman scanner
Comparative study of Raman Spectra and IR Spectra Raman Spectra IR Spectra It arises due to scattering of radiation by the vibrating molecule The polarizability of the molecule changes It arises due to the absoption of radiation by the vibrating The dipole moment of the molecule changes Photo chemical reaction takes place in Raman lines Photo chemical reaction do not take place in IR Spectra
