Light is entering a polarizer or set of polarizers from the

Light is entering a polarizer or set of polarizers from the left. Determine the relative intensity of the light exiting on the right after passing through all of the polarizers. The dashed vertical lines represent the vertical reference. The solid lines represent either the polarization angle of the light or the transmission angle of the polarizer. CW represents clockwise and CCW represents counterclockwise as viewed from the right looking back to the left along the path of the light.
Full Intensity Partial Intensity Zero Intensity  Unpolarized light enters from the left and passes through a single polarizer with the transmission axis oriented vertically (0° relative to the vertical).

Full Intensity Partial Intensity Zero Intensity  Linearly polarized light polarized at an angle 45° CW from the vertical enters from the left and passes through a single polarizer with the transmission axis oriented 45° CW relative to the vertical.

Full Intensity Partial Intensity Zero Intensity  Unpolarized light enters from the left and passes through a single polarizer with the transmission axis oriented horizontally (90° relative to the vertical).

Solution

I =Io*cos^2theta

part a)

theta = 0

cos0 =1

I = Io ( full intensity )

part b)

angle = 0

I = I0 full intensity

part c)

theta = 90

cos90 = 0

I = zero intensity

part d )

theta = 0

full intensity

part e )

theta = 0

full intensity