Polarization By Scattering

Bookmark added to your notes.
View Notes
×

We see that the charges occurring in a molecule are oscillating then we say that along the y-axis it will not radiate along the y-axis. Therefore here we conclude that  at 90° away from the beam direction the scatter which is by the light is linearly polarized. This is concluded to cause the light which generally undergoes Rayleigh scattering from the blue sky to be partially polarized.

[Image will be Uploaded Soon]


How Sunlight is Polarised

The light which is said to be an unpolarized light that is said to be passing through a fluid is scattered that is the scattered light which is being partially or completely plane polarized. For the light to get the effect of scattering by particles of comparable size to the wavelength of the light we can say that this process is known as  rayleigh scattering. The wavelength that is said to be generally dependent on this type of scattering is responsible for blue skies and red sunsets.


the light which is said to be the unpolarized white light which is from a slide projector enters a fish tank of very slightly milky water. Some of the waves which are known as the electromagnetic waves impinging on the colloidal particles and molecules in the water are said to be absorbed and re-radiated. The horizontal component that we have seen here is we can say of the polarization decreasing as cos2θ that is where θ is the scattering angle. We can hear see that the maximum scattered intensity is perpendicular to the plane, that is we can say of oscillation of the molecule which is  where it is also totally plane polarized, θ=90°. At the angles which are the other angles the light is partially plane polarized.

[Image will be Uploaded Soon]

To show this whole phenomenon we can say that the audience generally observes the tank at right angles to the initial direction which is the propagation of the light. A mirror which is said to be angled over the tank generally allows them to see scattered light emerging from two surfaces which are said to be perpendicular to each other we can easily observe it in the figure . The rotating which occurs in the Polaroid 90° blocks the light from the top of the tank but now we can say that the scattered light from the side of the tank reappears. Alternatively here we will say that or suppose that let the scattering process polarize an unpolarized beam from the slide projector and let the Polaroid sheet be the analyzer .


Rayleigh the phenomenon which is of the scattering has a wavelength dependence of 1/(λ4) so we can say that it generally affects blue light much more strongly than red. By adding the tank which is of milk to the tank we increase the scattering phenomenon  the milky water begins to develop a bluish tint and the unscattered beam reddish.


Polarisation by Refraction

[Image will be Uploaded Soon]

The is the kind of action that generally takes place in a 5 gallon fish tank. The mirror that is said to be 1m × 0.75m is hinged and its base can be clamped to a cart so we can say that the mirror then leans on the tank. The mirror which generally should be angled to give the center rows that is said to be of the audience which is of the optimum view of the upper surface of the tank so we can say that  this puts it at over 45° and unfortunately we can say that the view is not perfect for the front and back of the hall. Provide there is a beaker of milk and a pipette which is to add milk to the tank. The water which generally may be dirty enough initially to scatter well without adding milk. For a slide projector which we generally use a Beseler Slide King as it has a powerful 1000W bulb and along with that it holds a load with a 5cm circular aperture slide to simulate the Sun. It can also be said that it sit on the cart too but leaves a small distance between it and the tank so you can insert the Polaroid. The unscattered light that should generally fall onto a projection screen that is several meters ahead of the cart should be angled so that the audience can see the spot.


So here we need to be a  bit careful not to add too much milk that is as multiple scattering which will occur and wash out the color effect as well as the polarization. The symbol which is said to be denoted as λ-4 dependence is only valid if the scattering objects are smaller or comparable in size to the wavelength of the light. So it generally works for nitrogen and oxygen molecules but this is not for water droplets which are much larger than the symbol which is λ and scatter all colors equally so hence we can say that the clouds are white.


Polarisation by Scattering

A light wave which is also said to be an electromagnetic wave that travels through the vacuum of outer space. The waves which are of light are produced by vibrating electric charges. 

[Image will be Uploaded Soon]

The transverse nature of an electromagnetic wave is said to be quite different from any other type of wave that has been discussed in The Physics Classroom Tutorial.  So now Let's here suppose that we use the customary slinky to model the behavior of an electromagnetic wave. An electromagnetic wave is said to travel towards us and  then we would observe the vibrations of the slinky occurring in more than one plane of vibration. 

FAQ (Frequently Asked Questions)

Q1. Explain How is Sunlight Polarised by the Process of Scattering?

Ans: so as we see that the linearly which is of the polarised light can be said to be obtained by scattering. This is said to be possible because when the light is scattered by the air molecules then we can say that the incident light and the scattered light are perpendicular to each other so we hereby say that this is which is visualized as a tiny antennae.

Q2. Explain What Factor Affects the Polarization of Light by Scattering?

Ans: Most of the sources of light emit unpolarized light but we can also say that there are several ways light can be polarized. One of such ways to polarize light is by reflection. The reflection or the Light reflecting off a surface will tend to be polarized which is with the direction of polarization. That is we can say that the way the electric field vectors point is parallel to the plane of the interface.

Q3. Explain What is Interference Diffraction and Polarization?

Ans: And in the process which  is of diffraction the light waves are said to be traveling and interact with any object of size comparable to the wavelength of the light wave then it exchanges energy. These energies are given in  that object and we say the wave to be diffracted or scattered. In the process of polarization we generally restrict the vibrating components of electric and magnetic fields in a light wave.

Q4. Explain What Does Linearly Polarized Mean?

Ans: so can here by say that the linear polarization that is  the electric field of light is confined to a single plane along the direction of propagation. So we can say that the circular polarization: that is of the electric field of light consists of two linear components that are perpendicular to each other which is said to be  equal in amplitude but still have a phase difference of π/2.