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What will be the effect on focal length of a lens immersed in water ?

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To determine the effect on the focal length of a lens when it is immersed in water, we can use the lensmaker's formula, which is given by: \[ \frac{1}{f} = \left( \frac{n_2}{n_1} - 1 \right) \left( \frac{1}{r_1} - \frac{1}{r_2} \right) \] Where: - \( f \) is the focal length of the lens, ...
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