Explanation
A wave can transmit energy from one place to another.
For interference phase difference must be constant.
Interference is explained by wave nature of light.
Two coherent source must have a constant phase difference otherwise they can not produce interference.
Phenomenon of interference of light takes place.
Transverse waves can he polarized only.
Reflection phenomenon is shown by both particle and wave nature of light.
The locus of all particles in a medium vibrating in the same phase is called wavefront.
Wavefront is the locus of all the particles which vibrates in the same phase.
Direction of wave is perpendicular to the wavefront.
Origin of spectra is not explained by Huygen’s theory.
Energy is conserved in the interference of light.
Newton’s first law of motion states that every particle travels in a straight line with a constant velocity unless disturbed by an external force. So the corpuscles travels in straight lines.
Photoelectric effect verifies particle nature of light. Reflection and refraction verify both particle nature and wave nature of light.
Laser beams arc perfectly parallel. So that they are very narrow and can travel a long distance without spreading. This is the feature of laser while they are monochromatic and coherent these are characteristics only.
For interference frequency must be same and phase difference must be constant.
Wave theory of light is given by Huygen.
In interference of light the energy is transferred from the region of destructive interference to the region of constructive interference. The average energy being always equal to the sum of the energies of the interfering waves. Thus the phenomenon of interference is in complete agreement with the law of conservation of energy.
If one of slits is closed then interference fringes are nor formed on the screen but a fringe patterns is observed due to diffraction from slit.
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