Light

1
Light Electromagnetic Waves

2
Light Fundamentals

• Light - An Example of a Transverse Wave
• Speed of Light 3.0x 108 m/s

3
Light Fundamentals

• Light is electromagnetic radiation
• Light is simply a form of Energy that travels as
  a transverse wave.
• All electromagnetic waves travel at 3.0 x 108 m/s
• More on the Electromagnetic Spectrum

4
Light Sources

• Light Sources
• luminous vs. illuminous
• emits light vs. reflects light

5
Light Fundamentals

• Inverse-Square Relationship
• The illuminance of a body varies inversely with
  the square of the distance from the light source
• Luminous Flux, P
• rate at which light is emitted (measured in
  lumens, lm)
• Luminous Intensity
• the luminous flux that falls on one square meter

6
Light Fundamentals

• Illuminance, E
• The illuminous Intensity of a surface
• Measured in lumens per square meter or a lux, lx)
• E P / 4?r2

7
Light and Matter

• Transparent Materials
• Materials that allow light to pass through them
  in straight lines.

8
Light and Matter

• Translucent Materials
• Materials that transmit light but do not allow
  objects to be seen clearly through them.

9
Light and Matter

• Opaque Materials
• Materials that absorb or reflect light without
  remission and therefore allow NO light to pass
  through them.
• Opaque materials often create shadows where light
  can not reach

10
Light and Matter

• Polarization of Light
• The aligning of vibrations in a transverse wave,
  usually by filtering out waves of other
  directions
• 3D movies and other tricks Demos