Reflecting Surfaces

A reflecting surface is a surface that can reflect light or other types of electromagnetic radiation. When light hits a reflecting surface, it bounces off in a different direction. This phenomenon is called reflection.

There are several objects mentioned in the options, and we need to identify which one of them has a reflecting surface.

Mirror

A mirror is an object with a smooth and highly polished surface that can reflect light. It is specifically designed to produce clear and undistorted reflections. When light strikes a mirror, it bounces off at the same angle as it arrived, resulting in a clear reflection of the object. Mirrors are commonly used in homes, offices, and various optical devices.

Shallow Water

Shallow water, such as a pond or a pool, does not have a reflecting surface. When light falls on the surface of shallow water, it is partially absorbed and partially transmitted through the water. The surface of the water does not reflect light in a way that produces a clear image or reflection.

Thin Plastic

Thin plastic does not have a reflecting surface either. It is usually a transparent or translucent material that allows light to pass through it. When light encounters a thin plastic surface, it may be partially transmitted or scattered, but it does not produce a clear reflection like a mirror.

Lens

A lens is an optical device that can refract or bend light. It is made of transparent materials, such as glass or plastic. While a lens can manipulate the path of light, it does not have a reflecting surface. Light passing through a lens is bent or focused, but it does not produce a reflection like a mirror.

Therefore, the correct option among the given choices is Mirror (option B). It is the only object mentioned that has a smooth and highly polished surface designed for clear reflection of light.