Optics Question 1044
Laser beams are used to measure long distances because
[DCE 2001]
Options:
A) They are monochromatic
B) They are highly polarised
C) They are coherent
D) They have a high degree of parallelism
Show Answer
Answer:
Correct Answer: D
Solution:
Laser beams are nearly 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.
BETA
