Introduction
When light from two sources move in a direction then the light wave trains from these sources superimpose upon each other resulting in the modification of distribution of intensity i.e. we get
position of maximum intensity and positions of minimum intensity. This modification of light energy due to superposition of two or more wave trains is called interference.
- When the amplitudes of the two wave trains super impose crest to crest and trough to trough the resulting wave's amplitude is maximum (i.e. sum of amplitudes of individual waves) and is known as constructive interference.
- When the amplitudes of the two wave trains super impose crest to trough the resulting wave's amplitude is minimum (i.e. difference of amplitudes of individual waves) and is known as destructive interference.
Notes:
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Newton's Ring Experiment (VVI)
First investigated by Sir Issac Newton in 1666 Newtons rings are the phenomenon of interference of light through a plano-convex lens towards a flat surface in which a set of concentric rings of light and dark fringes can be observed.
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| fig: Newton's rings observed from a monochromatic source of light |
Derivations from Newton's ring experiment:
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