Answer:
Ā I = 0.2934 Iā
Explanation:
The expression that governs the transmission of polarization is
Ā Ā Ā Ā Ā I = Iā cosĀ² Īø
Let's apply this to our case, when the unpolarized light enters the first polarized, the polarized light that comes out has the intensity of
Ā Ā Ā Ā Iā = Iā / 2
this is the light that enters the second polarizer
Ā Ā Ā Ā I = Iā cosĀ² Īø Ā
Ā Ā Ā Ā Ā
we substitute
Ā Ā Ā Ā I = Iā / 2 cosĀ² 40
Ā Ā Ā Ā I = Iā 0.2934
Ā Ā Ā Ā I = 0.2934 Iā
