BRAINCAKELasers
LASER stands for Light Amplification by Stimulated Emission of Radiation.
Lasers are sources of monochromatic coherent light with rays almost perfectly parallel.
A convex lens can focus light onto a very fine spot.
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Key terms in this lesson
- Photon
- A discrete packet, or quantum, of electromagnetic energy.
- Coherent
- Waves are coherent if they have the same frequency and a constant phase difference.