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The curvature radii of a concavo-convex ...

The curvature radii of a concavo-convex glass lens are `20cm`and `60cm`.th convex surface of the lens is silvered .With the lens horizotnal ,the concave surface is filled with water.The focal length of the effective mirror is (`mu`of glass=`1.5,mu`of water=`4//3`

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The curvature radii of a concavo-convex glass lens are 20cm and 60cm . The convex surface of the lens is silvered .With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is ( mu of glass= 1.5,mu of water= 4//3

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The concave surface of a thin concavo-convex lens of index 1.5 has radius of curvature 50cm and 10cm respectively.The concave side is silvered andplaced on a horizontal surface as shown Focal length of silvered lens is: