CUET · PHYSICS · PYQ PAPER 2023
The power of the composite lens made of two thin lenses of focal lengths \(f_1\) and \(f_2\) placed in contact will be:
- A \(\frac{(f_1 + f_2)}{f_1 f_2}\)
- B \(\frac{f_1 f_2}{(f_1 + f_2)}\)
- C \(\sqrt{f_1 f_2}\)
- D \(\frac{1}{\sqrt{f_1 f_2}}\)
Answer & Solution
Correct Answer
(A) \(\frac{(f_1 + f_2)}{f_1 f_2}\)
Step-by-step Solution
Detailed explanation
\(P = P_1 + P_2\) \(P = \frac{1}{f_1} + \frac{1}{f_2}\) \(P = \frac{f_1 + f_2}{f_1 f_2}\)
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