# Wave Optics

## •    The continuous locus of all particles of a medium, vibrating in same phase is defined as wavefront. •    Wavefronts are of different types like spherical wavefront, cylindrical wavefront and plane wavefront which depend on the shape of light source. •    Huygens gave a hypothesis for a geometrical construction of the position of a common wave front at any instant, during the propagation of waves in a medium. •    Huygens principle explains the propagation of a wave front in a medium. Using the wavefront concept Huygen successfully explained the laws of reflection and refraction of light. •    The apparent change in frequency due to the relative motion between the source and the observer known as Doppler effect. Doppler effect is also in applicable for light waves. •    Coherent sources are the sources which emit continuous light waves of the same frequency and same phase or constant phase difference  whereas source of light which do not emit light waves with same frequency and a constant phase difference are known as non-coherent sources. •    Whenever two or more waves traveling through a medium superimpose on each other, a new wave is formed in which resultant displacement at any instant is equal to the vector sum of the displacements due to individual waves at that instant. •    The phenomenon of redistribution of light energy in a medium on account of superposition of light waves from two coherent sources is known as Interference of light. •    The wave theory of light of wave was revived by Thomas young, he recognized that interference phenomena provide proof of the wave properties of light. Thomas Young’s experiment is popularly known as Young’s double slit experiment or (YDSE).•    The phenomenon of bending of light around corners of an obstacle or aperture in the path of light is known as diffraction. Diffraction due to a single slit is observed when double slit in Young’s experiment is replaced by a single narrow slit. •    The phenomena of restricting the vibrations of light in a particular direction, perpendicular to the direction of wave motion is known as polarization. A polarized light can be produced by scattering of light through 90o in earth’s atmosphere and by reflection at a specific angle.

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