What type of lens is an air bubble inside water ?

What type of lens is a tumbler filled with water ?

Assertion : A star will appear to twink le if seen from free space (say moon)
Reason : An air bubbles inside water behave like a convergent lens .

Statement-1 : If there is a water bubble in air then excess pressure inside it is $\frac{4T}{R}$, where T is surface tension of water and R is the radius of the bubble.
Statement-2 : If there is a water drop in air then excess pressure inside it is $\frac{2T}{R}$1
Statement-3 : If there is an air bubble in water then excess pressure inside it is $\frac{4T}{R}$

What will happen to the potential energy of an air bubble in water when it rises in water ?

Suppose there is an air bubble of radius inside the air cavity of radius R inside a water drop of radius 3R as shown in figure. The ratio of gauge pressure at point C to gauge pressure at point B is: -B

Suppose there is an air bubble of radius inside the air cavity of radius R inside a water drop of radius 3R as shown in figure. The ratio of gauge pressure at point C to gauge pressure at point B is:

An air bubble rises up in water because pressure acting on air bubble,

An air bubble inside water behaves like a

An air bubble inside water behaves like a

How does an air bubble behave when it is inside water?