1. Light Introduction: Slide 1 Light Introduction

2. Light Introduction: Slide 2 Light -- an Electromagnetic Wave

3. Light Introduction: Slide 3 Electromagnetic Wave Transverse Traveling oscillating electric field and magnetic field Can travel through space Generated by accelerated charges Emitted by excited atoms when they return to ground state

4. Light Introduction: Slide 4 Electromagnetic Spectrum

5. Light Introduction: Slide 5

6. Light Introduction: Slide 6 Visible Part of Spectrum 7 4

7. Light Introduction: Slide 7 Spring Model Electrons can be modeled as particles connected to the atomic nucleus by springs Electrons of atoms in glass have certain natural frequencies of vibration

8. Light Introduction: Slide 8 Light Transmission

9. Light Introduction: Slide 9 Glass Transparency Ultraviolet matches natural frequency of electrons in glass Infrared vibrates entire atom or molecule Both result in warming of the glass

10. Light Introduction: Slide 10 Opaque What does it mean for an object to be opaque? Light is absorbed without being re- emitted.

11. Light Introduction: Slide 11 Umbra to Penumbra

12. Light Introduction: Slide 12 Solar Eclipse

13. Light Introduction: Slide 13

14. Light Introduction: Slide 14