GKFix MCQ Question

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