A) is highly monochromatic
B) is highly coherent
C) is highly directional
D) can be sharply focused
Correct Answer: D
Solution :
LASER is the short form of Light Amplification by Stimulated Emission of Radiation. It is a device by which an intense, monochromatic, collimated and highly coherent light beam can be obtained. Laser beam is used in surgery because it can be sharply focused.
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