REFLECTION

The reflection of light is the change of direction of the light rays that occurs in the same medium after striking the surface of a different medium. It is governed by two principles or laws of reflection:

The incident ray, the reflected and the normal to the surface at the point of incidence are in the same plane. The angle of the incident ray i and that of reflection rare equal

Considering the irregularities that may exist in the reflection surface, we can distinguish two types of reflections of light:

            Specular reflection: It occurs when the irregularities of the medium are small compared to the wavelength of the incident light and several rays are projected on it.

Diffuse reflection: It occurs when the irregularities of the medium are of an order of magnitude comparable to the size of the wavelength of the incident 

light and several rays are projected on this specular and diffuse reflection.

On the left, the specular reflection in which the rays remain parallel after reflection occurs. On the right, the diffuse reflection where the rays intersect with each other in all directions.

Sample:

In the figure above, from P 

$\rightarrow$right arrow

 Q a ray of light passes from air through glass with a refraction index of 1.5. If the angle of reflection is 30°, what is sin of the angle of refraction?

Answer:

1/3