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(D) When the mirror is filled with water,the light rays from the object at $C$ undergo refraction at the water-air interface before reaching the mirro

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real,and located at a point between $C$ and $O$

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(D) When the mirror is filled with water,the light rays from the object at $C$ undergo refraction at the water-air interface before reaching the mirror surface. Due to refraction,the apparent position of the object shifts upwards to $C^{\prime}$,where $OC^{\prime} = R\mu$ (where $\mu$ is the refractive index of water). Since the object is effectively at a distance greater than $R$ from the mirror,the mirror forms a real image $I^{\prime}$ between the centre of curvature $C$ and the focus $F$. As the reflected rays travel back,they again undergo refraction at the water-air interface. This second refraction causes the rays to bend further,shifting the final image $I$ downwards towards the pole $O$. Thus,the final image is real and is located at a point between $C$ and $O$.

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