CUET · PHYSICS · PYQ PAPER 2023
Two thin lenses are in contact and the focal length of the combination is 60 cm. If the focal length of one lens is 20 cm, the focal length of the other would be :
- A 60 cm
- B - 30 cm
- C 20 cm
- D 15 cm
Answer & Solution
Correct Answer
(B) - 30 cm
Step-by-step Solution
Detailed explanation
\( \frac{1}{F} = \frac{1}{f_1} + \frac{1}{f_2} \) \( \frac{1}{60} = \frac{1}{20} + \frac{1}{f_2} \) \( \frac{1}{f_2} = \frac{1}{60} - \frac{1}{20} = \frac{1 - 3}{60} = -\frac{2}{60} = -\frac{1}{30} \) \( f_2 = -30 \) cm
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