Light known to be polarized in the horizontal direction is incident on a polarizing sheet.It is observed that only 15 percent of the intensity of the incident light is transmitted through the sheet.What angle does the transmission axis of the sheet make with the horizontal?
A)8.6º
B)21º
C)23º
D)67º
E)81º

Question

Quizplus · Accepted Answer

Malus's law: I = I0 cos^2 θ, where I0 is the intensity of the incident light, I is the intensity of the transmitted light, and θ is the angle between the transmission axis of the polarizing sheet and the polarization direction of the incident light.In this case, I = 0.15I0, so cos^2 θ = 0.15. Therefore, θ = 67º.

Light Known to Be Polarized in the Horizontal Direction Is