Question

A drop of water behaves like a ______ lens

Answer 1

1. A water drop has the shape of a convex lens as it bulges out in the middle.
2. It is a converging lens. Here light rays enter the water droplet parallel to its axis and then converge at a single point on the opposite side.
3. A water drop has a higher refractive index than the air. So light will converge on going from air into water droplet.

Hence, a drop of water behaves like a convex lens.