Fix the diode laser(in the mirror mount) to one extreme side of the optic bench. Connect the diode laser with power supply.

Mount the photodiode detector in the other, extreme, end of the optic bench. Connect the photodiode with o/p display and measurement unit .Switch ON the diode laser and detector o/p measurement unit.

Mount the polarizer and analyser in between the laser and the detector, the one near the laser is the polariser and the other one will be analyser(As shown in fig.1).

Adjust the laser in the mirror mount such that the laser light falls on the pinhole of the detector after passing through the analyser and the polariser.

Rotate the polarizer to get minimum intensity on the analyser(keeping in mind that the laser light is polarized in one direction)

Make the transmission axis of both polarizer and analyser parallel, to get zero intensity.(Remember, analyser angle is measured w.r.t. transmission axis of polarizer, i.e. it is a relative angle)

Now fix the polarizer(for the duration of the entire experiment), and only rotate the analyser and take angle vs photocurrent readings for every 10^o or 5^o change in analyser angle up to 360^o

Plot a graph of Photocurrent (Y-axis) vs Analyser (X-axis) angle and also a polar plot of the photocurrent vs angle.