Applied Physics I: Chapter 8: Applied Optics - Interference
Conditions for Interference
For interference to occur between two sources, the following conditions has to be satisfied.
CONDITIONS
FOR INTERFERENCE
For
interference to occur between two sources, the following conditions has to be
satisfied.
1.
There must be two sources which are coherent in nature (i.e) They must be same
wavelength, frequency and amplitude.
2.
The sources should have constant phase difference (or) zero phase difference.
3.
The sources should be closer to each other and the distance between the sources
and the screen must be larger.
4.
For constructive
interference (i.e) for bright fringes to appear, the path difference
between the two waves which are interfering should babe equal to nλ.
Path
Difference = nλ
5.
For destructive
interference (i.e) to get dark fringes.
Path
Difference = (2n+1) λ/2
Special
Case
When
light is reflected from the surface of an optically denser medium like glass, a
phase change of π (or) a path difference of λ/2 occurs and hence the path
difference for the formation of Bright fringes and Dark fringes will be all
reversed
i.e.,
The path difference Δ = (2n+1) λ/2 for bright fringes
and
The path difference Δ=nλ for dark fringes.
Applied Physics I: Chapter 8: Applied Optics - Interference : Tag: Applied Physics : - Conditions for Interference
Applied Physics I: Chapter 8: Applied Optics - Interference
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