It is referred to as light reflection when a light ray hits a polished, smooth surface and bounces back. The incident light rays hit the surface and are reflected off of it. The beam that returns is referred to as the reflected ray. On a reflecting surface, a perpendicular would be considered normal. The reflection of an incident beam on a flat mirror is depicted in the figure below.
Law of reflection
Incident light rays are reflected according to the rules of reflection on reflecting surfaces like mirrors, slick metal surfaces, and crystal-clear water. Consider the example of a plane mirror in the image above. According to the law of reflection,
All three rays—the incident, reflected, and daily—lie in the same plane.
The angle of reflection = Angle of incident
different types of reflection
1-specular reflection of light
2-Diffused reflection of light
3-Multiple reflections of light
specular reflection of light
The mirror-like reflection of waves, such as light, from a surface, is known as specular reflection, also known as regular reflection.
According to the law of reflection, a reflected light ray exits a reflecting surface at the same angle to the surface normal as the incident ray but on the other side of the surface normal in the plane formed by the incident and reflected rays. Hero of Alexandria was the first to describe this behavior (AD c. 10–70). 
In contrast to diffuse reflection, which scatters light away from the surface in a variety of directions, specular reflection is the opposite.
Diffused reflection of light
In contrast to specular reflection, which only occurs at one angle, diffuse reflection occurs when light is reflected from a surface at multiple angles. An ideal diffuse reflecting surface will have Lambertian reflectance, or equal luminance coming from all directions in the hemisphere encircling the surface. A surface made of a non-absorbing powder, fibers, or a polycrystalline substance, such as white marble, efficiently diffusely reflects light. A lot of everyday materials show a combination of specular and diffuse reflection.
When a laser beam strikes a highly smooth, opaque surface at a specific angle, practically all of the light is reflected off the interface in a limited number of directions. The surface, as depicted deemed to be extremely glossy. An observer can see the reflected images of the surroundings at specific viewing angles on the surface. Due to the numerous angles at which light strikes an extremely rough surface, the interface tends to reflect light at many different angles. Because of how diffuse the reflected light is, the viewer is unable to see images of the surroundings. This matte surface’s reflection can be seen in
reflection from a rough surface that is dispersed. Each incident ray’s reflected light adheres to the law of reflection. However, because of the material’s roughness, every ray encounters a surface with a unique orientation. Different rays have a different normal line at the site of the incident. The individual rays then scatter in various directions as they hit the rough surface and obey the law of reflection. The concentrated bundle of light rays that strikes the rough surface as a result is diffusely reflected. Five incident rays—labeled A, B, C, D, and E—are depicted in the picture as they approach a surface. At each point of incidence, the approximate normal line is displayed without a direction arrow. In every
Simply put, “multipath” is a term used to describe reflections of the same RF signal being reflected from different and multiple surfaces. Since it is much more pronounced in digital communications systems, we will limit this discussion to digital comms. The RF signal is a digital representation of an analog signal When an object is positioned in front of a mirror, only one picture is produced. What occurs when we employ two mirrors? A single light source can reflect light several times due to the excellent ability of reflecting surfaces like mirrors to maintain the intensity of light in a reflection. These numerous reflections are feasible up until the point at which the light is so weak that we cannot see it. As a result, the number of possible multiple reflections is practically unlimited. Every reflection has an image that we can see. This implies that each image is a product of, or an image of, another image.