21.There is an air bubble inside water refractive index 4/3.At what distance from air bubble should a point object be placed so as to form a real image at the same distance from the bubble------------

A real image can not be formed in the given case.
Bubbles are formed, when air is trapped in water, because the air is less dense it rises in the form of a bubble to escape into the atmosphere. The air bubble will behave as a diverging lens due to its bulging curvature. And a diverging lens always form a virtual and erect image.

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