However, the angle must be in radians instead of degrees, and should be converted by multiplying it by pi/180. Hints remaining: 3 Feedback: 0% deduction per feedback. In summary, when calculating the intensity of transmitted light passing through a polarizer at an angle of 30.0 degrees, the correct equation to use is I1I0cos2 (theta). Grade Summary 13 = 4 (m + 1 )/ml Deductions Potential 100% 0% cos(a) 9 HOME sin(a) cos(o) sin(0) B 6 cos(O) sin(O) 0 h ( 7 8 ^^ 4 5 1 * 1 2 + - 0 VO BACKSPACE Submissions Attempts remaining: 5 (0% per attempt) detailed view 1 0% a 3 END d 10 g m t DEL CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Use trigonometric identities to simplify and give the results in terms of a single trigonometric function of o = 20. Randomized Variables Ray Direction Io = 1350 W/m2 A = 45° A 20% Part (a) What is the intensity of the light in W/m2 after it passes through the first polarizer? A 20% Part (b) What is the intensity of the light in W/m2 after it passes through the second polarizer? A 20% Part (C) What is the intensity in W/m² of the light after it passes through the third polarizer? * 20% Part (d) Write an equation for the intensity of light after it has passed through all three polarizers in terms of the intensity of unpolarized light entering the first polarizer lo and the angle of the second polarizer relative to the first, given that the first and third polarizers are crossed (90° between them). It tells us that the intensity of light that passes through a polarizer, I, usually measured. The axis of the third polarizer is horizontal. Maluss Law is an equation that tells us how much dimmer the light is after going through a polarizer. The best known crystal of this type is tourmaline. They can therefore be used as linear polarizers. The axis of the second polarizer is rotated at an angle 0 = 45° from the vertical. What we can measure relatively easily is the intensity of the light when viewed through a polarizing filter oriented at various angles. Absorptive polarizers Certain crystals, due to the effects described by crystal optics, show dichroism, preferential absorption of light which is polarized in particular directions. The axis of the first polarizer is vertical. Analyzer: An analyzer is a device used to check if the light is plane-polarized or not. (10%) Problem 10: Unpolarized light of intensity lo = 1350 W/m2 is incident upon three polarizers. The intensity of a plane-polarised light that passes through an analyzer varies as the square of the cosine of the angle between the plane of the polarizer and the transmission axes of the analyzer. 20 Part(d) Write an equation for the intensity of light after it has passed through all three polarizers în terms of the intensity of unpolarized light entering the first polarizer Io and the angle of the second polarizer relative to the first, given that the first and third polarizers are crossed (90° between them).
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