First slide

Coherent sources and their importance in interference

Question

Laser beams are used to measure long distance because

Easy

A

They are monochromatic
B

They are highly polarised
C

They are coherent
D

They have high degree of parallelism

Solution

Laser beams are 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.

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