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A thin convex lens made from crown glass $\bigg(\mu=\large\frac{3}{2}\bigg)$ has focal length $f.$When it is measured in two different liquids having refractive indices $\large\frac{4}{3}$ and $\large\frac{5}{3}$, it has the focal lengths $f_1$ and $f_2$ respectively. The correct relation between the focal lengths is

$(A)\; f_2 > f\; and \;f_1\; becomes\;negative \\ (B)\; f_1\; and\; f_2\; both\; become\; negative \\(C)\;f_1 = f_2 < f \\(D)\;f_1 > f\; and\; f_2\; becomes \;negative $

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The correct relation between the focal lengths is $f_1 > f\; and\; f_2$ becomes negative
Hence D is the correct answer.
answered Apr 7, 2014 by meena.p
 

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