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Linearly polarized light that is oriented along the x-axis and has intensity I0 is incident on...

Linearly polarized light that is oriented along the x-axis and has intensity I0 is incident on a linear polarizer (LP1) with transmission axis oriented at an angle θ1=15° clockwise with respect to the x axis. The light then passes through a second linear polarizer (LP2) with transmission axis oriented at an angle θ2 = 45° counterclockwise relative to the x axis as shown before passing through a quarter wave plate. The fast axis of the quarter wave plate is aligned with the y-axis

What is the intensity of the light after the second linear polarizer (LP2) but before the quarter wave plate?

What is the polarization after the light passes through the quarter wave plate?

Keeping the linear polarizers and quarter wave plate exactly the same, the incident light is now changed to be unpolarized as shown below. What is the intensity of light measured after the quarter wave plate(IQWP)?

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