Polarised light is to have its polarisation plane rotated by 90$\degree$.In which of the following cases does the final beam have the greatest intensity?
A)3 polarising filters, each rotate beam by 30$\degree$.
B)2 polarising filters, both rotate beam by 45$\degree$.
C)1 polarising filter, rotating beam by 90$\degree$.
D)None of the above, polarised light can't be rotated.

Question

Quizplus · Accepted Answer

Using three polarising filters each rotating the beam by 30$\degree$ results in the greatest intensity due to the gradual rotation, minimizing intensity loss compared to a single 90$\degree$ rotation.

Polarised Light Is to Have Its Polarisation Plane Rotated by 90