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Which of the following are the properties of a laser?

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Which of the following are the properties of a laser?

(a) Highly collimated

(b) Monochromatic

(c) Coherent light beam

(d) All of the mentioned

The question was asked in my homework.

This question is from Laser Beam Machining-Introduction in portion Thermal Processes of Advanced Machining

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The correct option is (d) All of the mentioned

Explanation: Highly collimated, high monochromaticity and the coherence of the light beam are the properties of a laser.

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