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Properties of Light

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Properties of Light Waves, particles and EM spectrum Interaction with matter Absorption Reflection, refraction and scattering Diffraction and polarization – PowerPoint PPT presentation

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Title: Properties of Light


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
Snells 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/polarizedl
ight/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/in
dex.html
21
Mammalian Eye
22
Far and near sightedness
23
Light Diffraction
http//webphysics.ph.msstate.edu/javamirror/ipmj/j
ava/slitdiffr/
24
Color
25
Color Spectra
26
Color has 3 dimensions
27
Light interference
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