A spherical surface of radius of curvature \( R \), separates air (refractive index \( 1.0 \) ) ...

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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 \( P Q \) cuts the surface at a point \( O \) and \( P O=O Q \). The distance \( P O \) is equal to
(a) \( 5 R \)
(b) \( 3 R \)
(c) \( 2 R \)
(d) \( 1.5 \mathrm{R} \)
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