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  4. A point object is placed at the centre of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is

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Q. A point object is placed at the centre of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is

IIT JEEIIT JEE 2004

Solution:

When the object is placed at the centre of the glass sphere, the
rays from the object fall normally on the surface of the sphere
and emerge undeviated.
Hence, the correct option is (c).