An air bubble inside water. The refractive index of water is 4/3 . At what distance from the air bubble should a point object be

An air bubble inside water. The refractive index of water is 4/3 . At what distance from the air bubble should a point object be placed so as to form a real image at the same distance from the bubble:-
A. 2R
B. 3R
C. 4R
D. The air bubble cannot form a real image

An air bubble inside water. The refractive index of water is 4/3 . At what distance from the air bubble should a point object be placed so as to form

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