Question

In Figure (a) below, unpolarized light is sent into a system of three polarizing sheets.The angles θ₁, θ₂, and θ₃ of the polarizing directions are measured counterclockwise from the positive direction of the y axis (they are not drawn to scale). Angles θ₁ and θ₃ are fixed, but angle θ₂ can be varied. Figure (b) gives the intensity of the light emerging from sheet 3 as a function of θ₂. (The scale of the intensity axis is not indicated.) What percentage of the light's initial intensity is transmitted by the three-sheet system when θ₂ = 94^o?

X o 1 (a) 1 0 00 02 60° 120° 180° (b)

Answer 1

solution عليا (ط) sheet at = 600 From figure that can easily estimate at 별 Goo and O₂ = 1400 the intensity of light Uzero. It means that sheet 2 is perpendicular to one of the and to other sheet o at Oz=140°. gr general case Let 0,= 1500, ₂ = 50° Now given given o= quo 3 = let Io after passing through three palarire final intomi a I = Io cos²560 cas²440 =) ) or viceversa = 4yo | 02-0195 56 102-03 is initial intensity of light I = 8.09% 2 Io I 8.10% - Io