Physics
In spherical polar coordinates (l, q, a), q denotes the polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by

Pcosq sina
Psinq cosa
Psinq sina
Pcosq cosa

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Physics
Energy in reflected light :

Decreases with the increase in angle of incidence
Becomes maximum for angle of incidence equal to 45°
Does not depends on the angle of incidence
Increases with the increase in angle

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