What we can conclude from the diagram is that in the case of reflection incident angle which is the angle at which is incident ray falling at the surface, is equal to the angle at which it is reflected from the surface.

We can also see that incident ray, reflected ray and normal always lay in the same plane.

Two laws of reflection are:

1., Angle of incidence and angle of reflection are always equal.

2., The incident ray, the reflected ray and normal lie in the same plane.

1., Angle of incidence and angle of reflection are always equal.

2., The incident ray, the reflected ray and normal lie in the same plane.

a. Specular reflection is caused by shiny and polished surface like metals where the beam of light rays incident on it is reflected from it in the same direction. It appears that the entire beam has reflected. This kind of reflection causes glare in the eye and the shiny and glossy surface appears to be the light source itself. In diffused reflection however, the different rays of the beam of light are incident and reflected of different points on a rough, irregular surface and hence the light beam appears to have diffused. (Note that the word rough here does not mean stone-rough, it means not polished, shiny or glossy. For example a nicely polished furniture surface is also rough under a microscope although it might seem smooth to touch.)

b. Reflection of sunlight from a metallic car body can sometimes be specular. Reflection of light from a stone is an example of diffused reflection. We see objects comfortably because of diffuse reflection. Specular reflection causes glare in the eye.

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Specular reflection is reflection on the smooth surfaces such as glass, mirror etc.

It can be used as an extra lightning and enhances brightness in the kitchen, bathroom or bedroom.

On the other hand diffuse reflection is reflection on the rough surfaces which are walls in these rooms diffuse lights that are too much bright.

Specular reflection can be used for better lightning and enhancing brightness of these rooms by applying mirrors, glass etc.

And diffuse reflection diffuse lights that are too bright, and main role in this have walls.