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Which of the following are the character...

Which of the following are the characteristics of Laser beams? (1) They are monochromatic (2) They are coherent (3) They have high degree of parallelism (4) They are not monochromatic

A

They are monochromatic

B

they are coherentthey have high degree of parallelism

C

they are not monochromatic

D

1 and 3 are correct

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