Optics Question 1044

Question: Laser beams are used to measure long distance because

[DCE 2001]

Options:

A) They are monochromatic

B) They are highly polarised

C) They are coherent

D) They have high degree of parallelism

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Answer:

Correct Answer: D

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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