THE LIGHT

THE LIGHT

1. Light is an electromagnetic wave.

   • With a much higher frequency and much shorter wavelength than radio waves.
     • Steps:
       • Wave
         • Light polarization
           • Types of polarization
             • Vertical Polaritazion
             • Horizontal Polarization
       • Electromagnetic.

2. In 1865, Maxwell summarized all data on electricity and magnetism

   • The equations of the electromagnetic potentials can be written as e
     • This evolution equation is a wave equation,
       • Wave
         • In physics is any propagating imbalance, and that a harmonic wave is a wave described by a sine curve.
           • Satisfies equation for any value
             • Amplitude ?0
             • Phase ?
             • Angular frequency ?
               • Wave vector
                 • The relation ?(?) between the angular frequency and the wave vector
                   • So-called dispersion relation
                     • is the main property of any type of wave
                     • Is linear
                     • Phase velocity ?
                       • independent of the frequency
                       • Amplitude or phase of the wave

3. Electromagnet ic waves

   • is linear in the field
     • Two waves can cross each other without disturbing each other
   • interference
   • Waves can travel undisturbed across static electromagnetic fields
   • Superposition of harmonic
   • Move with the speed of light.

4. BEAM OF LIGHT

   • Light beams cannot be arbitrary narrow lines.
   • Determined and limited by the wavelength
   • Geometric arrangement that produces it.

5. Matter on light

   • internal electromagnetic fields
   • full of electromagnetic fields and accelerated electric charges.
   • The electromagnetic Lagrangian

6. Classical electrodynamics

   • indeed unifies the description of electricity, magnetism and optics
   • All phenomena in these fields are different aspects of the evolution of the electromagnetic field.

7. Polarization ion of electromagnet ic waves

   • in the parameter ?0 in expression
   • Waves oscillate in directions perpendicular to their motion
   • They can have different polarization directions
   • is defined
     • Convention
     • The orientation of the electric field vector
   • Easily achieved also for light
   • occurs when
     • The polarization occurs when
       • Form a continuous set
       • is perpendicular to the direction towards the Sun.
       • He light is scattered by the molecules in the air.
   • General plane wave
     • Can be seen as the superposition of two orthogonal
     • Linearly polarized waves with different amplitudes and different phases

8. Light can also be unpolarized

   • is a mixture of light of various polarizations.
   • Light from the Sun and from other hot sources is typically unpolarized
     • Due to the Brownian motion of the emitting sources

9. Wave in three-dimensional space

10. The range of electromagnetic radiation

    • More accurately as an oscillating dipole.
    • He intensity of radio waves decreases slowly with distance

11. Light can touch, light can rotate, and light can be touched

12. COLOR

    • frequencies correspond to different colours.
    • Monochromatic light
    • Mixture of several different colours
    • Colour experts call hue that aspect of colour that matches most closely the change with wavelength.
      • Every colour has two additional characteristics
        • Brightness
          • Is a second, independent property of colour
        • its saturation
          • Is the opposite of a pale

13. signal speed

    • The transport of information using the transport of energy.
    • We can thus ascribe a propagation speed
    • The highest possible signal speed is also the maximal velocity of the general influences

14. Fun with rainbows

    • Primary rainbow is 2.25°
    • The secondary rainbow it is about Twice that value
    • The width is larger than the dispersion angle difference

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