It is about an experiment of the polarization How can you tell if a light source
ID: 1518442 • Letter: I
Question
It is about an experiment of the polarization How can you tell if a light source emits natural or polarized light? 2) Describe what the Brewster angle is. 3) What can you say about the state of polarizations of the two rays that emerge after passing through the calcite crystal? 4) Does your experimental result for the variation of light intensity versus angle between the polarizers agree with Malus' Law (Equation 3)? Elaborate. 5) From Malus, Law, when the angle between the axes is 25degree, what should the intensity be relative to the maximum intensity (i.e. what is I/I_0)? Does this agree with your dat (read the maximum intensity and the intensity at 25degree from your graph and compare their ratio to your answer).Explanation / Answer
1) Shine light through two polarizing filters oriented at 90° to each other, and no light gets through. But put a third filter inbetween them, at 45° to each of the existing filters, and - some lights gets through . An unpolarized, parallel light source is fired through a polarizing filter, and the light strongly registers in a light meter at the other end.
2) The reflection coefficient for light which has electric field parallel to the plane of incidence goes to zero at some angle between 0° and 90°, the reflected light at that angle is linearly polarized with its electric field vectors perpendicular to the plane of incidence and parallel to the plane of the surface from which it is reflecting. The angle at which this occurs is called the Brewster angle.
3) One ray is partially polarized and the other is totally plane polarized .
4) According to malus law, when completely plane polarized light is incident on the analyzer, the intensity I of the light transmitted by the analyzer is directly proportional to the square of the cosine of angle between the transmission axes of the analyzer and the polarizer. i.e I = Io cos2 .
The experimental result agrees with Malus's Law .
5) Here, I/Io = cos225
= 0.821
=> It agrees wiith the graphical data .
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