There are two thin symmetrical lenses : ...

There are two thin symmetrical lenses : one is converging , with refractive index `n_(1) = 1.70`, and the other is diverging with refractive index `n_(2) = 1.51`. Both lenses have the same curavature close together and submerged into whater. What is the focal length of this system in water ?

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There are two thin symmetrical lenses : one is converging , with refractive index `n_(1) = 1.70`, and the other is diverging with refractive index `n_(2) = 1.51`. Both lenses have the same curavature close together and submerged into whater. What is the focal length of this system in water ?

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