A converging glass lens (n = 1.50) is immersed in water. Does the focal length get longer

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A converging glass lens (n = 1.50) is immersed in water. Does the focal length get longer or shorter and by what factor? Explain why. In the lens maker’s formula in Equation 24.32, the term n - 1 is actually the difference between the index of refraction of the lens and the surrounding air.

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