CUET · PHYSICS · PYQ PAPER 2023
Two thin lenses of power + 3D and - 1D are held in contact with each other. Focal length of the combination would be :
- A \( 5 \text{ m} \)
- B \( 50 \text{ cm} \)
- C \( 10 \text{ m} \)
- D \( 100 \text{ cm} \)
Answer & Solution
Correct Answer
(B) \( 50 \text{ cm} \)
Step-by-step Solution
Detailed explanation
\( P_{total} = P_1 + P_2 \) \( P_{total} = +3 \text{ D} - 1 \text{ D} = 2 \text{ D} \) \( F = \frac{1}{P_{total}} = \frac{1}{2 \text{ D}} = 0.5 \text{ m} \) \( F = 0.5 \text{ m} \times 100 \text{ cm/m} = 50 \text{ cm} \)
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