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Q.

A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let ‘O’ be the pole of the mirror and ‘C’ be its centre of curvature. A point object is placed at ‘C’ . Whose real image is also formed at ‘C’. If the mirror is now filled with water, the image will be  

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a

real and will be located above C

b

real and will remain at C

c

virtual, and will be located below O

d

 real, and will be located between C and O

answer is D.

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Detailed Solution

Focal length of the concave mirror is independent up on refractive index of surrounding  medium.
 

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A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let ‘O’ be the pole of the mirror and ‘C’ be its centre of curvature. A point object is placed at ‘C’ . Whose real image is also formed at ‘C’. If the mirror is now filled with water, the image will be