Question

Does an air bubble inside water behave like a lens? If so, what type of lens is it? Explain?

Answer 1

1. We know that refractive index of air is $1$ and refractive index of water is $1.33$.
2. Water is the denser medium and the air is the lighter medium.
3. When a light ray is passed it moves from a denser to a lighter medium.
4. Air bubble inside water behaves like diverging lens i.e., a concave lens because of air inside the bubble and water outside the bubble.

Hence, an air bubble inside water behaves like a concave lens.