What is irregular reflection? State one advantage of irregular reflection
Answers
Answer:
Irregular reflection, or diffusion, consists of reflection in which the reflected rays of light are not parallel but take various directions, thus destroying the image of the light source. Rough, unpolished surfaces give such reflection. Smooth, unpolished surfaces generally give a combination of two kinds of reflection.
Diffused reflection is very important in the study of illumination inasmuch as diffused light plays an important part in the lighting of interiors. This form of reflection is seen in many photometer screens.
Light is also diffused when passing through semi-transparent shades or screens. In considering reflected light, we find that, if the surface on which the light falls is colored, the reflected light may be changed in it nature by the absorption of some of the colors. Since, as has been said, in interior lighting the reflected light forms a large part of the source of illumination, this illumination will depend upon the nature and the color of the reflecting surfaces.
Whenever light is reflected from a surface, either by direct or diffused reflection, a certain amount of light is absorbed by the surface. Table XIII gives the amount of white light reflected from different materials.
Answer:
Diffuse reflection is the reflection of light or other waves or particles from a surface such that a ray incident on the surface is scattered at many angles rather than at just one angle as in the case of specular reflection. An ideal diffuse reflecting surface is said to exhibit Lambertian reflection, meaning that there is equal luminance when viewed from all directions lying in the half-space adjacent to the surface.
A surface built from a non-absorbing powder such as plaster, or from fibers such as paper, or from a polycrystalline material such as white marble, reflects light diffusely with great efficiency. Many common materials exhibit a mixture of specular and diffuse reflection.
The visibility of objects, excluding light-emitting ones, is primarily caused by diffuse reflection of light: it is diffusely-scattered light that forms the image of the object in the observer's eye.
Advantage
When a movie is projected on the screen by a projector it is viewed from different seats in a hall is due to irregular reflection. When a ray/beam of light is incident on a smooth and plane surface, the resulting reflected rays will be at the same angle as the ray/beam of incident rays.
An object is visible to the observer's eye only because of diffused or irregular reflection (except light emitting ones). In diffuse reflection, the light rays are in various angles because of the surface and are not parallel to incident rays
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