Polarization. Polarization Have you ever wondered how polarized sunglasses are able to reduce the glare of light off a surface? In the photographs shown.

Slides:



Advertisements
Similar presentations
Science AHSGE Standard VII
Advertisements

What is polarized light? x Looking "head-on" we only see the blue arrows up & down y z x y z Light is polarized if the light wave and electric force field.
Polarization of Light Waves
Polarization Electromagnetic Waves February 2005.
Now that we have determined the solutions to the differential equation describing the oscillations of the electric and magnetic fields with respect to.
PH 103 Dr. Cecilia Vogel Lecture 2. RECALL OUTLINE  Polarization of light  Ways to polarize light  Polaroids  Fraction of light thru polaroid  Electromagnetic.
Electromagnetic Waves Physics 202 Professor Vogel (Professor Carkner’s notes, ed) Lecture 11.
6. Interference by thin films t No phase shift (if n 2 < n 1 ) Phase shift -_____ (if n 2 > n 1 ) If there is a very thin film of material – a few wavelengths.
Office Hours Office hours are posted on the website. –Molly: Tuesdays 2-4pm –Dr. Keister: Wednesdays 10am-12 –Prof. Goldman: Wednesdays 2-3:30pm All office.
Reading Activity Questions? IB Assessment Statements Topic Polarization: Describe what is meant by polarized light Describe polarization.
Polarization.
Polarization.
The speed of light is a constant because the electric and magnetic fields support each other. If the speed of light was not constant energy would not be.
Covered in class on Monday 4/11 (Week 14) Jonathan Szuch.
Transverse wave is a wave in which the direction of displacement is perpendicular to the direction of propagation, as a surface wave of water.
2 nd & 3 th N.U.T.S. Workshops Gulu University Naples FEDERICO II University 7 – Polarization.
Polarization Polarization is a characteristic of all transverse waves.
Lecture 13 Electromagnetic Waves Ch. 33 Cartoon Opening Demo Topics –Electromagnetic waves –Traveling E/M wave - Induced electric and induced magnetic.
11: Wave Phenomena 11.5 Polarisation. Polarisation When a charged particle loses energy, a tiny disturbance or ripple in the surrounding electromagnetic.
6. Interference by thin films
Review: Laws of Reflection and Refraction
Why Objects Have Color Visible light is a combination of many wavelengths (colors), which give it a white appearance. When light hits an object certain.
Demo: Two polarized lens, overhead, cellophane tape placed on a piece of plastic or/and wrapped around a clear ruler. Place one polarized lens on overhead.
Electromagnetic Waves
Chapter – 16 Light. Electromagnetic radiation – energy carried through space in the form of waves.
L 32 Light and Optics-4 Up to now we have been studying geometric optics Today we will look at effects related to the wave nature of light – physical optics.
4.3 IB Wave Characteristics
Light Polarization These three are the same… Light *pure energy Electromagnetic Waves *energy-carrying waves emitted by vibrating electrons Photons *particles.
29:006 FINAL EXAM FRIDAY MAY 11 3:00 – 5:00 PM IN LR1 VAN.
Color Polarization Reflection and Refraction Snell’s Law….
Polarization Electromagnetic Waves. Electromagnetic Wave.
Color and Polarization. Color Determined by frequency of light reaching the eye Hot bodies produce different frequencies of light depending on temp. -
Chapter 9.6 Polarization. Simple concepts of Polarization Waves on a string Diagram of vertical wave on a string (string is always in the vertical plane)
Polarization Electromagnetic Waves. Electromagnetic Wave.
L 33 Light and Optics [4] Measurements of the speed of light  The bending of light – refraction  Total internal reflection  Dispersion Dispersion 
Happy Friday!!! Get ready for warm up # 2 Quiz postponed Get out a paper to take notes on Title these notes “Light and Polarization” You will turn.
 WAVE - a transfer of energy that does not transfer matter.  MEDIUM –the substance that a wave moves in.  OSCILLATION – to swing or move regularly.
Light Fundamental Properties. Fundamentals of Light Light is radiation, which we can see. Light is only a small portion of the electromagnetic spectrum,
 Electromagnetic wave (light) - a wave that consists of electric and magnetic fields.  These waves are produced when a charged particle oscillates 
6. Interference by thin films t If there is a very thin film of material – a few wavelengths thick – light will reflect from both the bottom and the top.
The Wave Nature of Light
Electromagnetic Waves
L 32 Light and Optics [3] Measurements of the speed of light 
Electromagnetic Waves
Polarization of Electromagnetic Waves
Color & Polarization and Refraction
A: Wave Phenomena A.6 Polarisation.
6. Interference by thin films
Electromagnetic waves and polarization
The Polarization of Light
Color and Polarization
Chapter 13 Light and Reflection
11: Wave Phenomena 11.5 Polarization.
Unit 4.1 Electromagnetic Waves
L 34 Light and Optics [4] Measurements of the speed of light 
Polarization.
Thomas Young Young’s double-slit experiment (1801): provided concrete evidence for the wave nature of light.
Review of Properties slides 2- 7 Wave Behaviors slides
Conformational Isomers Configurational Isomers cis-trans isomers isomers that contain chirality centers.
Diffraction and polarisation
Electromagnetic waves
6. Interference by thin films
Polarization.
L 32 Light and Optics-4 Up to now we have been studying geometric optics Today we will look at effects related to the wave nature of light – physical optics.
What are the jobs of Sunglasses?
monochromatic light source
Polarization Light travels as a transverse wave, with the electric and magnetic fields oscillating perpendicular to the forward motion of the wave Light.
Refractive Optics Chapter 26.
AP Physics 2 Chapter 24 Section 4.
Presentation transcript:

Polarization

Polarization Have you ever wondered how polarized sunglasses are able to reduce the glare of light off a surface? In the photographs shown below the glare has been removed from the music store window by using a polarizing filter on the camera.

Polarization Polarization can be understood by using a rope model of light waves. The transverse mechanical waves in the rope represent the electromagnetic waves of light. The slots represent what is referred to as the polarizing axis of the polarizing medium.

Polarizing Media Polarizing media contain long molecules in which electrons can oscillate, or move back and forth, all in the same direction. Polarizing media contain long molecules in which electrons can oscillate, or move back and forth, all in the same direction. As light travels past the molecules, the electrons can absorb light waves that oscillate in the same direction as the electrons. As light travels past the molecules, the electrons can absorb light waves that oscillate in the same direction as the electrons. This process allows light waves vibrating in one direction to pass through, while the waves vibrating in the other direction are absorbed. This process allows light waves vibrating in one direction to pass through, while the waves vibrating in the other direction are absorbed. The direction of a polarizing medium perpendicular to the long molecules is called the polarizing axis. The direction of a polarizing medium perpendicular to the long molecules is called the polarizing axis. Only waves oscillating parallel to that axis can pass through. Only waves oscillating parallel to that axis can pass through.

POLARIZATION

Polarization by Filtering Ordinary light actually contains waves vibrating in every direction perpendicular to its direction of travel. If a polarizing medium is placed in a beam of ordinary light, only the components of the waves in the same direction as the polarizing axis can pass through. On average, half of the total light amplitude passes through, thereby reducing the intensity of the light by half. The polarizing medium produces light that is polarized, meaning that it has a single plane of oscillation.

Polarization by Reflection When you look through a polarizing filter at the light reflected by a sheet of glass and rotate the filter, you will see the light brighten and dim. The light is partially polarized along the plane of the glass when it is reflected. That is, the reflected ray contains a great deal of light vibrating parallel to the surface of the glass. The polarization of light reflected by roads is the reason why polarizing sunglasses reduce glare. Light reflected off a non-metallic object is polarized parallel to the surface.

Polarization

Question???? You are out waterskiing one day and you notice that the suns light if reflecting off the water. Is this reflected light polarized?

Another Question???? The reflected light would be polarized – what is the orientation of the polarized light? Is it horizontally or vertically polarized?