CUET · PHYSICS · PYQ PAPER 2025
An eye specialist prescribes spectacles having a combination of a converging lens of focal length 25 cm and a diverging lens of focal length of 20 cm. The power of the combination of two lenses (in dioptre) is
- A 1
- B -1
- C 1.1
- D 2
Answer & Solution
Correct Answer
(B) -1
Step-by-step Solution
Detailed explanation
\(P_1 = \frac{1}{f_1} = \frac{1}{0.25 \text{ m}} = 4 \text{ D}\) \(P_2 = \frac{1}{f_2} = \frac{1}{-0.20 \text{ m}} = -5 \text{ D}\) \(P_{total} = P_1 + P_2 = 4 \text{ D} + (-5 \text{ D}) = -1 \text{ D}\)
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