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
Show Answer
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.
