1 / 27

Properties of Light

Properties of Light. Waves, particles and EM spectrum Interaction with matter Absorption Reflection, refraction and scattering Diffraction and polarization. EM Wave. Light waves. Complex light. Single wave = monochromatic light. Coherent light = laser. Polarized light.

astra
Download Presentation

Properties of Light

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 = n1sinq1 = n2sinq2 where ni = 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

More Related