Consider two mirrors and a light source. The mirrors form an angle
φ and
-φ with a horizontal axis, and the light source is located at horizontal axis and near junction of the two mirrors (see the black dot below).

The light source emits light of total power
P with uniform distribution. Assume the mirrors are perfect reflectors. Also assume that this system is only 2 dimensional. Find the distribution of power,
dP/dθ, as a function of
θ (the angle formed by light and horizontal axis after the light is out from the system)!
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