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The image of an object placed in air for...

The image of an object placed in air formed by a convex refracting surface is at a distance of 10 m behind the surface. The image is real and is at `(2^(rd))/(3)` of the distance of the object from the surface. The wavelength of light inside the surface is `(2)/(3)` times the wavelength in air. The radius of the curved surface is `(x)/(13)m`. The value of 'x' is _________.

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