Fact 1: Alaser is used for producing light.

Fact 2: Lasers, for instance, produce coherent light.

Given the two facts above, answer the question "Lasers produce beams that are:" with the following options: 
- photons
 - coherent
 - laboratory
 - dangerous
 - electricity
 - diode
 - xenon
 - positive


 

  coherent       