A transparent sphere of refractive index ' \(\mu\) ' and radius of curvature ' \(R\) ' is kept in air. A point object is placed at a distance ' \(d\) ' from the surface of the sphere so that the real image is formed at the same distance ' \(d\) ' from exactly opposite side of the sphere. The distance ' \(d\) ' is
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Symmetric refraction:
Object distance = image distance $\Rightarrow$ special condition