# 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

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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
A. (1)/(2)
B. (1)/(4)
C. (1)/(3)
D. (3)/(4)

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