When the transmitter and receiver are set up as shown in this diagram with the transmitter and reciever slits parallel:

the intensity on the receiver reads 0.98 mA. A polarising sheet is now placed between the transmitter and the receiver such that the polariser makes an angle of 30^o with the slit in the transmitter. This is shown in the diagram below.

What signal strength would you expect the detector to detect now?

mA

(Note: the receiver measures the intensity in mA)