Question a converging glass lens n 140 is immersed in, Ask an Expert

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Question: A converging glass lens (n = 1.40) is immersed in water. Does the focal length get longer or shorter and by what factor? Explain why.

I want you to explain the physics in this problem. Hint: In the lens maker formula, the term n - 1 is actually the difference between the index of refraction of the lens and the surrounding air.

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