Answer:
answer is A corresponding to 60 W
Explanation:
The polarization phenomenon is descriptor Malus's law
Ā Ā Ā I = Iā cosĀ² Īø
Where I and Io are the transmitted and incident intensities, respectively, Īø Ā is the angle between the direction of polarization of the light and the polarizer.
Unpolarized light strikes the first polarizer and half of it is transmitted, which has the polarization direction of the polarizer
Ā Ā Ā Iā = Ā½ Iā
Ā Ā Ā Iā = Ā½ 300
Ā Ā Ā Iā = 150 W
The transmission by the second polarizer (P2) is
Ā Ā Ā Iā = Iā cosĀ² Īø 1
Ā Ā Ā Iā = 150 cosĀ² 45
Ā Ā Ā Iā = 75 W
The transmission of the third polarizer (P3)
Ā Ā Ā Iā = Iā cosĀ² Īø 2
Ā Ā Ā Iā = 75 cosĀ² 30
Ā Ā Ā Iā = 56.25 W
This is the light transmitted by the 56 W system, the closest answer is A corresponding to 60 W
