Let's take the initial light intensity to be I0.
The light is circularly polarized initially.
From the one-half rule, the irradiance of the light transmitted by the first sheet is:
Ifirst = I0/2
Suppose I1 is the intensity of light transmitted through two polarizing filters with axes at a relative angle θ, and I2 is the intensity when the axes are at a relative angle 90.0° -θ.
What was the original intensity, I0, assuming the light started out unpolarized?
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