Igcse Model Questions Vol1 2021 Physics Question 18
Practice objective / multiple choice question 18 from the 2021 Igcse Model Questions Vol1 Physics examination.
A thin converging lens of unknown focal length is placed in air. An object is positioned \(25\ \text{cm}\) in front of the lens and a sharp real image is formed on a screen \(75\ \text{cm}\) behind the lens. (a) Find the focal length of the lens in air. (b) The same lens is now immersed in water (refractive index \(n_{\text{water}} = 1.33\)). The lens material has refractive index \(n_{\text{lens}} = 1.50\). Keeping the object at the same \(25\ \text{cm}\) distance (measured in water), determine the position of the image formed (state the image distance from the lens and indicate whether the image is real or virtual).
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About This Question
This is Igcse Model Questions Vol1 2021 Physics Question 18. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Medium .
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