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• Kinematics & Rotational Motion
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```				   ust got to thinking about interference, if we have two sources (say a  laser beam split in two), and introduce a phase shift between the two by  making them travel different path lengths, then recombine them, we see  fringes in the wavefront right. (interferometry)  My problem is this, if we have two perfectly monochromatic and perfectly  collimated (i.e. no divergence as they propagate out to infinity)  beams, the fringes would not be visible right? as the transverse pattern  occurs due to the fact that the beams are indeed slightly divergent.  You would however see a spot of light whose brightness in proportional  to the phase difference between the two beams.
```

6 years ago

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```										Dear nitin,
If I understand you correctly, it is true that in order to use  interfereometry as a tool, there needs to be some bias present (some  fringes) to increase the accuracy.

We are all  IITians and here to help you in your IIT  JEE preparation.  All the best.

Sagar Singh
B.Tech IIT Delhi
sagarsingh24.iitd@gmail.com

```
6 years ago

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