Laser beams are used in surgery because they are

Options :
  1. highly monochromatic
  2. highly coherent
  3. directional
  4. high focusing power


Answer and Explanation :-

Answer: Option 2

Explanation:

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And out of that hopeless attempt has come nearly all that we call human history-money, poverty, ambition, war, prostitution, classes, empires, slavery-the long terrible story of man trying to find something other than God which will make him happy.
-C.S. Lewis Mere Christianity