Neco 2023 Physics Question 29
Practice objective / multiple choice question 29 from the 2023 Neco Physics examination.
A converging lens of unknown focal length \(f\) forms a real image of a candle placed \(30\,\text{cm}\) in front of it on a screen that is \(45\,\text{cm}\) behind the lens. A second thin converging lens of focal length \(10\,\text{cm}\) is positioned \(5\,\text{cm}\) behind the first lens, and the combined system still forms the image on the same screen. Determine the focal length \(f\) of the first lens (in centimetres, to one decimal place).
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About This Question
This is Neco 2023 Physics Question 29. It is one of the objective questions from the 2023 Neco Physics examination.
Difficulty level: Medium .
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