A laser beam is used for carrying out surgery because it

is highly monochromatic

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is highly coherent

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is highly directional

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can be sharply focused

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Solution

The correct option is D
can be sharply focused

Explanation for the correct option(s):
D: can be sharply focused
Surgery needs a sharply focused beam of light for the purpose of precise cutting with no scope of error.
Since the laser beams are sharply focused, hence it can be widely used in surgery.
Option D is correct.

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