Two polarizers A and B are aligned so that their transmission axes are vertical and horizontal, respectively. A third po

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Two polarizers A and B are aligned so that their transmission axes are vertical and horizontal, respectively. A third polarizer is placed between these two with its axis aligned at angle with respect to the vertical.
Assuming vertically polarized light of intensity is incident upon polarizer A, find an expression for the light intensity.
Calculate the derivative dI/dθ.
Express your answer in terms of the variables
Light of wavelength 560 nm alls on a slit that is 3.80×10^−3mm wide.
Estimate how far the first brightest diffraction fringe is from the strong central maximum if the screen is 10.0 mm away.It says 2.21 is not correct with 3 sig figs