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(D) The air bubble is located at the centre $O$ of the solid glass sphere.When light rays originating from the air bubble travel towards the surface o

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Zero

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(D) The air bubble is located at the centre $O$ of the solid glass sphere.When light rays originating from the air bubble travel towards the surface of the sphere, they move along the radius of the sphere.Since the radius is always perpendicular to the surface of the sphere, the light rays strike the surface at an angle of incidence $i = 0^\circ$.According to Snell's law, when light is incident normally on a surface, it does not undergo any refraction or deviation.Therefore, the light rays continue to travel in a straight line without bending.As a result, the observer looking from outside sees the image of the bubble at the same position as the object.Thus, the apparent distance of the bubble from the centre of the sphere is zero.

There is a small air bubble at the centre of a solid glass sphere of radius $r$ and refractive index $\mu$. What will be the apparent distance of the bubble from the centre of the sphere, when viewed from outside?

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