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Two thin symmetrical lenses of different...

Two thin symmetrical lenses of different nature and of different material have equal radii of curvature `R = 15 cm`. The lenses are put close together and immersed in water `(mu_(w) = (4)/(3))`. The focal length of the system in water is 30 cm. The difference between refractive indices of the two lenses is

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Two thin sysmmetrical lenses of different nature and of different material have equal raii of curvature R=15cm . The lenses are put close together and immersed in water (mu_(w)=4//3) . The focal length of the system ini water is 30cm. The difference between refractive indices of tthe two lenses is

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Two identical glass (mu_(g)=3//2) equiconvex lenses of focal length f are kept ini contact. The space between the two lenses is filled with water (mu_(w)=4//3) . The focal length of the combination is

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