1. 4/19/06 Spectra: Continuous vs. Discrete Friday’s Reading: Section 14.3: Lasers and LEDs (pp. 464 – 470) Upcoming Reading Assignments: Section 15.1: Cameras (pp. 478 – 488) Section 15.2: Optical Recording and Communication (pp. 489 – 497)

3. Visible light portion of EM spectrum Sunlight & Blackbody Radiation

4. Exercise: Wavelength, Frequency, Energy of Light Consider visible light from the violet end of the spectrum. This light has wavelength 400 nm. Calculate the following: Frequency:Energy:

5. Continuous vs. Discrete Spectra

6. How do we get Discrete Spectra?