Applied Physics I: Chapter 8: Applied Optics - Interference
Super Position of Waves and Interfeerence of Light
The interference is based on the super position principle, which states that, "when two (or) more light wave trains act simultaneously on any particle in a medium, the particle is displaced due to the superposition of all the wave trains".
SUPER POSITION OF WAVES
AND INTERFERENCE OF LIGHT
The
interference is based on the super position principle, which states that,
"when two (or) more light wave trains act simultaneously on any particle
in a medium, the particle is displaced due to the superposition of all the wave
trains".
Interference:
When two light waves from the sources superimposes on each other then the
resultant amplitude in the region of superposition is different than the
amplitude of the individual waves. This modification of light energy i.e.
change in amplitude is called as interference.
When
the amplitude of the resultant is equal to the sum of the amplitude of the two
waves, then the interference is called constructive interference and the
field of view is bright. When the amplitude of the resultant is equal to the
difference of two amplitudes the interference is known as destructive interference
and the field of view is dark.
Superposition Principle
This
principle states that the resultant displacement of a particle in a the medium
acted upon by two or more waves simultaneously is the algebraic sum of the
displacement of the same particle due to individual waves.
Interference in thin films
We
are familiar with the beautiful colours produced by a thin film of oil on the
surface of water and also by a thin film of a soap bubble. This phenomenon is
based on the principle of interference between light reflected from the top and
the bottom surface of a thin film.
It
has been observed that interference in the case of thin film takes place
(i)
Reflected light and
(ii)
Transmitted light
Applied Physics I: Chapter 8: Applied Optics - Interference : Tag: Applied Physics : - Super Position of Waves and Interfeerence of Light
Applied Physics I: Chapter 8: Applied Optics - Interference
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