1. LASERS

2. Incoherent Light Sun Light bulbs Candle flames Many wavelengths make up this type of light

3. Coherent Light Light of a single wavelength that are in phase This type of light is produced by Lasers

4. Review: Incoherent vs. Coherent Light

5. L.A.S.E.R A device that produces coherent light at a single wavelength Light Amplification by Stimulated Emission of Radiation

6. Real World Benefits to Using Lasers Measure distances with great precision Telescope lasers are used to measure the distance from earth to distant objects Since all wavelengths are in the same direction, a laser can easily be pointed at distant reflectors

7. Real World Benefits (Medicine) LASIK surgery Body tissues absorb different wavelengths of light Treat tissues that cannot be reached by conventional surgical methods ex: glaucoma