polarization by scattering

The phenomenon in which unpolarized light get polarized when scatter from a atom is called polarization by scattering

When a unpolarized light having frequency w strike a atom on surface . The atom absorb electromagnetic radiation and start vibrating with same frequency w . And resulting radiation of electromagnetic waves . Those atom or charged particles may not free of constraints . I.e they not free to vibrate in any direction result absorbing some E vector components (or B) 
Results polarized of partially polarized light. Example is our sky  And also it depends upon in which angle you look at image Below a image to demonstrate


Comments

Post a Comment

Popular posts from this blog

Nicol prism

Image
The phenomenon of double refraction of certain crystals can be used to produce plane polarized light. As we know the double refracting crystal split two different ray having two different state of polarization . say E-ray and O-ray  . It is consist of calcite crystal with a layer of Canada balsam . for E-ray refractive index 1.486 and for O-ray refractive index 1.658  the refractive index for Canada balsam   1.55  which is lie between refractive index of calcite crystal of E-ray 1.48 and for O-ray  1.65 .  The observation of the values of refractive indices reveal that the Canada balsam is a denser medium than calcite for E-ray and is a rarer medium than calcite for O-ray  The calcite crystal is taken in the form of parallelogram with grounded edges with angle 109 degree and 71 degree . Due to grounding the acute angles get reduced to 68 degree.  The light is incidents such that O-ray [going from denser to rarer medium] suf...
Read more

Polarization equation : lissajous figures

Image
We know there are three types of polarization exist . Those are  1) . Linearly polarized 2) . Elliptically polarized 3) . Circularly polarized In any type of polarized light we have specified E-vector  direction resulting vector when act on a point charged particles the path in which particle move it is ellipse the light is said to be elliptically polarized  .if it is circle or line the the light is called circularly , linearly polarized respectively .  Proof Consider 2( why two well it can be more but we considering the source that spontaneously  emitting different amounts of photon per second resulting different amplitude and period of emissions is different resulting different phases for example if time period t =lambda/4c     then phase difference is 90 degree )  Electromagnetic wave having same frequency different phases( same wave different amplitude and phase for refraction or reflection emittion etc  .) act on a charge particl...
Read more

Malus law

Image
When any source such as light bulbs or sun emit electromagnetic wave . the Electric field direction on the source is randomly generated by that result a unpolarized light . the E vector that generated on the source emission depends upon the direction of motion of charge particle which is completely random .. We use a polarizer to polarize unpolarized light .  Working of Polarizer is very simple it cancel out all E-vector components except that parallel to axis of polarizer that a polarized light .  Malus law relate intensity of polarized light after passing through polarizer with its previous intensity Proof We know intensity of light directly proportional to the square Amplitude .I.e consider the case of bellow image we have the angle between A vector and optical axis of polarizer is thita Resolving those vectors components we have horizontal and vertical components  Now using the above results we conclude that after pas...
Read more