2
Example 10 2 Discuss the intensity of transmitted light when a
polaroid sheet is rotated between two crossed polaroids Solution Let I0 be the intensity of polarised light after passing through
the first polariser P1 Then the intensity of light after passing through
second polariser P2 will be
2
0cos
I
I
θ
=
,
where q is the angle between pass axes of P1 and P2