Explain the role of resonant cavity in determining the coherence and monochromaticity of a laser light.

A resonant cavity, or optical cavity, plays a crucial role in determining the coherence and monochromaticity of laser light. It consists of two or more mirrors facing each other, forming a closed loop that allows light to circulate multiple times through the laser medium.

### Coherence

**Spatial Coherence:**
The resonant cavity ensures that the light waves traveling back and forth between the mirrors remain in phase. ________ ________ __________ ___ ________ _____ ________ _______.
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