The polarized light of a laser diode passes through two polarizers, P₁ and P₂. Polarizer P₁ has its transmission axis along the y-axis, while the transmission axis of the second polarizer forms an angle Φ  with respect to the y-axis. The incident light, of initial intensity I_i, is polarized along the y-axis. Calculate Φ if the transmitted light intensity at position M is I_i/8.

• A. Φ = 60.00°
• B. Φ = 69.30°
• C. Φ = 75.52°
• D. Φ = 82.20°

Answer: (B)