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An equi-convex lens of focal length F in...

An equi-convex lens of focal length F in air is is cut into two halves along the plane perpendicular to the optic axis. One of the halves is placed between a fixed object and a screen separated by distance of 90 cm . Two images are formed on the screen for two different positions of the lens with magnification 2 and 1/2 respectively. Find the value of F . what would be the value of the focal length of the equiconvex lens if the lens is immersed in water ? Refractive index of the material of the lens is 1.5 and that of water is `mu_w=4//3`.

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40 cm
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