Physics

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Topic : The Application of Malus's Law on Polarizer

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LSHS Name of Learner: Notic Grade and Section: Date: be no tra intensity formula GENERAL PHYSICS 2 ACTIVITY SHEET The Application of Malus's Law on Polarizers where angle di 1. Learning Competency with Code Calculate the intensity of the transmitted light after passing through a series of polarizers applying Malus's Law. (STEM_GP120PTIVc-18) Sample I1. Background Information for Learners Ar pass thr A physicist Etienne Louis Malus conducted an experiment in 1809 and observed with the the effects of polarizers on the intensity of light. He proved that one characteristic of Calcula light is its ability to be polarized. Based on the result of his experiment, he formulated polarize Malus Law in his honor, which describes the relationship between the incident light beam's intensity and the transmitted light beam's intensity as it varies with respect to Solutio the e of the polarizers. Malus Law could be expressed mathematically as: 1 = locoszed Given: where I refers to the Intensity of transmitted light , 0. is the angle 10=20 difference between the transmission axis of the two polarizers and the I, which is 91=40 the initial intensity of the light beam. 2=3 III. Activity Proper Ask Activity 1 11 & A polaroid is a commercial sheet of material that is capable of transmitting certain component of light aligned at particular angle or direction at the same time direction. blocks or absorb certain components of light that are perpendicular to the specified Not You could consider two polaroids and set the second one in such a way that its transmission axis is set at a particular angle @ with reference to that of the first polaroid. When these materials are placed in succession to one another and allow a beam of light to pass through, the first material is labelled as polarizer and the second one is considered as analyzer. Consider Figure 1 below Transmission axis unpolarized light Od Transmission Axis Polarizer Figure 1 Two polaroid's whose transmission axis forms an angle Od. AnalyzerSHS Donen Notice that if the two polarizers are set in such a way that the 0,=900 there will be no transmission of light's beam. Using Malus Law you can also compute for the intensity / of light beam that was able to pass through a series of polarizers using a formula I = locos20d where I is the intensity of light with a unit Weber/ meter and the angle is the angle difference between the transmission axis of two polarizers. polarizers Sample Problem 1 An unpolarized beam of light having an intensity of 20.0 W/m was made to pass through two polarizers. The first polarizer has a transmission axis set at 400 observed with the vertical. The analyzer has its transmission axis set at 30 from the vertical. eristic of Calculate the intensity of a light beam that is transmitted through the a.) first mulated polarizer b.) second polarizer dent light spect to Solution: Given: lo=20.0W/m2 81=400 lich is 02=300 ed= 100 Asked: 11 & 12 a. 11=? me cified Note: If the light is unpolarized, it behaves like two equal intensity waves acting at right angle or perpendicular to each other. You can therefore consider that one of at its them which is aligned to the transmission axis is allowed to pass though while the other one is blocked or absorbed. Thus, the transmitted light on the first polaroid will llow a have an intensity which is 11= 1/2 lo = 10 = (0.50)20.0 W b. 12=? me = 10 W It will now be the incident intensity of light that will attempt to pass through the second polarizer, thus using Malus Law /2 = 1, cos ed 12 = 1,cos204 = 10 W "ma COS 10'=9.70SHS Activity 1: Directions. Calculate the intensity of transmitted light beam on two polaroids using Malus Law. Identify the given and the unknown. Show your process. Problem: An unpolarized beam of light having an intensity of 30.0 W/m was made to pass through two polarizers. The first polarizer has a transmission axis set at 600 with the vertical. The analyzer has its transmission axis set at 250 from the vertical. Calculate the intensity of a light beam that is transmitted through the a.) first polarizer b.) second polarizer Guide Questions 1. What happen to the intensity of the transmitted light as the angle difference of the two polaroids transmission axis decreases? 2. At what angle difference of the two polaroids transmission axis will the intensity be at it its maximum? IV. Reflection What are your realizations upon learning this lesson?Wiley.com,2021.http://bcs.wiley.com/hebcs/Books?action=index &itemld=047 13205 "Resnick, Halliday, Krane: Physics, Volume 1, 5th Edition - Student Companion Site." VI. Other References and Electronic Sources Problem Solving 1. 11=15.0 W mz 2. 12=10.1 W Guide Questions 1. It increases 2. when Od= 0 or they are parallel V. Answer Key S