Question

The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. The axis angle of polarizer B is set at 120°. What is ratio of the intensity of the beam at the observer to the intensity I0 of the source?

Answer 1

Answer:

Explanation:

Intensity of unpolarized light = I(o)

Intensity of light after first polarization by polarizer A. = I(o)/2

Angle between A and B = 120 degree.

Intensity of light after second polarization = I Cos² θ

= I(o) /2 x cos²120 = I(o) /8 .

Angle between B and C is 70 degree

Intensity of light after third polarization =

I(o)/8 x Cos² 70 = 0.1156 x I (o) /8 =

Required ratio =.01445