1. Properties of Light Waves, particles and EM spectrum Interaction with matter Absorption Reflection, refraction and scattering Diffraction and polarization

2. EM Wave

3. Light waves Complex light Single wave = monochromatic light Coherent light = laser Polarized light

4. Electromagnetic spectra High frequency EM acts like a particle Low frequency EM acts like a wave

5. Interaction with matter Color occurs when molecules selectively absorb light of specific wavelengths High energy, short wavelengths, disrupts chemical bonds Infrared radiation affects bond vibrations and is perceived as heat (snakes, vampire bats have heat sensors, but poor resolution) Light is selective absorbed and reradiated in a transparent medium

6. Requirements for Vision Reflection off solid objects –Higher and lower frequencies pass through Straight-line transmission without scatter –Permits formation of spatial maps Refraction at the boundary of two media with different densities –Permits focusing and image formation by an eye behind a lens

7. Absorption depends on wavelength

8. Absorption depends on frequency

9. Water absorbs red faster than blue

10. Speed of light depends on media Speed of light is slower in water than in air (opposite to sound)

11. Light reflects and refracts air water Snell’s law = n 1 sin  1 = n 2 sin  2 where n i = refractive index

12. Refraction http://micro.magnet.fsu.edu/primer/java/refraction/index.html

13. Reflectance Diffuse (dull, matte)Specular (shiny)

14. Large angle causes internal reflections air water cell

15. Scatter depends on wavelength

16. Sun is yellow, sky is blue

17. Polarized Light http://micro.magnet.fsu.edu/primer/java/polarizedlight/filters/index.html

18. Polarized light indicates solar position

19. Refraction depends on frequency

20. Lenses focus light http://micro.magnet.fsu.edu/primer/java/magnify/index.html

21. Mammalian Eye

22. Far and near sightedness

23. Light Diffraction http://webphysics.ph.msstate.edu/javamirror/ipmj/java/slitdiffr/

24. Color

25. Color Spectra

26. Color has 3 dimensions

27. Light interference