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Using P_combined = 1/45 cm⁻¹ and P_glass_air = 1/30 cm⁻¹, what is the power of the liquid layer (P_liquid)?
A. (1/90) cm⁻¹
B. -(1/90) cm⁻¹
C. (1/15) cm⁻¹
D. -(1/15) cm⁻¹
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