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  4. 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 it's centre of curvature. A point object is placed at C. It has a real image, also located at C (a condition called auto-collimation). If the mirror is now filled with water, the image will be:

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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 it's centre of curvature. A point object is placed at C. It has a real image, also located at C (a condition called auto-collimation). If the mirror is now filled with water, the image will be:

NTA AbhyasNTA Abhyas 2020Ray Optics and Optical Instruments

Solution:

Solution
Due to refraction at water surface object will appear beyond C. This image will act as an object for reflection by mirror. So image will be real, and located between C and O