CUET · PHYSICS · PYQ PAPER 2025
Two lenses of focal lengths, 20 cm and - 25 cm, respectively are placed in contact with each other. The power of the combination of lenses is
- A 1D
- B 10 D
- C -5 D
- D -1 D
Answer & Solution
Correct Answer
(A) 1D
Step-by-step Solution
Detailed explanation
\(P_1 = \frac{1}{f_1} = \frac{1}{0.20 \text{ m}} = 5 \text{ D}\) \(P_2 = \frac{1}{f_2} = \frac{1}{-0.25 \text{ m}} = -4 \text{ D}\) \(P_{total} = P_1 + P_2 = 5 \text{ D} - 4 \text{ D} = 1 \text{ D}\)
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