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:-

Options

A. R
B. 2R
C. 3R
D. air bubble cannot form real image

Answer

D

Explanation

Air bubble is inside water and hence medium inside bubble is rarer than medium outside it. So its behaviour will be like a concave lens and hence it cannot form real image for real object. Hence, option (d) is correct.