Unpolarized light of intensity S0 passes through two sheets of polarizing material whose transmission axes make an angle of 60° with each other as shown in the figure.What is the intensity of the transmitted beam, ST? 
Definitions:
Semispinalis Thoracis
A muscle in the back that extends from the thoracic vertebrae to the base of the skull, helping in the extension and rotation of the spine.
Multifidus
A muscle located in the spine that stabilizes the vertebrae and assists with spinal movements.
Quadratus Lumborum
A deep muscle in the lower back that helps with the stabilization of the pelvis and the spine, as well as aiding in lateral movement of the torso.
Serratus Posterior
A muscle group consisting of the serratus posterior superior and inferior, which aid in the movements of the rib cage.
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