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Q)

A double convex lens $(\mu =1.5) $ has its focal length 10 cm. What will be its focal length if it is immersed in liquid of $(\mu_1=\large\frac{4}{3})$

$(a)\;\frac{10}{3}\;cm \\ (b)\;\frac{40}{3} \;cm \\ (c)\;40\;cm \\ (d)\;10\;cm $

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