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Question
Physics
Laser beams are used to measure long distance because:
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Q. Laser beams are used to measure long distance because:
Wave Optics
A
They are monochromatic
2%
B
They are highly polarised
6%
C
They have high wavelength
8%
D
They have high degree of parallelism
83%
Solution:
Laser beam are monochromatic and coherent and it is perfectly parallel so that they are narrow and can travel a long distance without spreading.