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A spherical surface of radius of curvature \(R\), separates air (refractive index \(1.0\)) from glass (refractive index \(1.5\)). The centre of curvature is in the glass. A point object \(P\) placed in air is found to have a real image \(Q\) in the glass. The line \(PQ\) cuts the surface at a point \(O\) and \(PO\ =\ OQ\). The distance \(PO\) is equal to:
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