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A lens has a power of +5 diopter in air what will be its power if completely immersed in water ? $ \mu_g =\large\frac{3}{2};$$ \mu_w=\large\frac{4}{3}$

$(a)\;\frac{1}{3}\;D \\ (b)\; \frac{2}{3}\;D \\ (c)\;\frac{2}{3}\;D \\ (d)\;\frac{5}{3}\;D $

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