A point object is placed at the centre of a glass sphere of radius \( 6 \mathrm{~cm} \) and refr...

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A point object is placed at the centre of a glass sphere of radius \( 6 \mathrm{~cm} \) and refractive index \( 1.5 \). The distance of the virtual image from the surface of the sphere is
(A) \( 2 \mathrm{~cm} \)
(B) \( 6 \mathrm{~cm} \)
(C) \( 4 \mathrm{~cm} \)
(D) \( 12 \mathrm{~cm} \)
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