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How to solve this 

Asked by amitjena226 21st December 2017, 10:30 PM
Answered by Expert
Answer:
Because the laser beam has very less divergence (angular spread) as compared to other light sources, it can travel long distance without getting diffused. This makes laser beam unidirectional.
 
answer:- 4 
Answered by Expert 22nd December 2017, 11:24 AM
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