Showing posts with label Reflection. Show all posts
Showing posts with label Reflection. Show all posts

Friday, May 24

Diffuse Reflection

Introduction to diffuse reflection:

The light rays travels in the straight line. The ray of light travels with the velocity of 3 × 108 metre per second. If the ray of light travels from one medium to another medium it suffers refraction due to the change in the velocity of light in different mediums. If the ray of light falls on the smooth and polished surface it suffers reflection. Here we discuss about reflection.I like to share this Fundamentals of Fluid Mechanics with you all through my article.

Diffused reflection:

The bouncing back of the light rays after striking from the highly polished and the smooth surfaces is called reflection. The image formed on retina so the we can see the objects is the very important example of reflection. As the rays of light falls on any object, the rays are reflected from the object and then enter in our eye. Now from the refraction of the eye lens the image of the object is formed on the retina. After that, the optical nerves carry the optical signals to the mind as the mind gives the permission to see the object we can see the image of the object very clearly. The reflection are of two types: one is called the specular or regular reflection and the other is diffused or irregular reflection. In the case of regular reflection, it obeys the laws of reflection completely but in case of the diffused reflection, it does not obey the laws of reflection completely. The diffused reflections are done by the non-polished or the slightly polished and non smooth or rough surfaces. As the rays of light falls on a rough and non-polished surface at any angle of incidence then the angle of reflection is not equal to the angle of incidence. Here the rays of light do not follow the first law of reflection. Similarly, the normal to the reflecting surface, incident ray and the reflected ray are not lie in the same plane, so the rays of light do not follow the second law of reflection.

Examples of the diffused reflection measurement:

The examples of the diffused reflection are the reading of newspaper or reading of a notebook. As we read the newspaper the images of the letters can be produce on the retina. Similarly, the ray of light from our body is reflected but the reflection is diffused so that we cannot see our image on the newspaper.

Wednesday, May 1

Two Types of Reflection

Introduction to Two types of Reflection

When light traveling in one medium strikes a boundary leading to another medium, a part of incident light is through back into the original medium one. This phenomenon is called reflection of light.

Reflection is of two types:

Regular reflection
Irregular reflection or diffuse reflection

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The Two types of reflection

1.    Regular reflection: When the reflection surface is smooth and well polished, the parallel rays falling on it are reflected parallel to another one, the reflected light goes in one particular direction. This is regular reflection. The smooth and well polished surface is called mirror. Silver metal is one of the best reflectors of light. So, ordinary mirrors are made by depositing a thin layer of silver metal on one side of a plane glass sheet. The silver layer is protected by a coat of red paint. The reflection of light in a mirror takes place at the silver surface. A plane mirror is represented by a straight line, with a number of short, oblique lines showing back of the mirror.

2.    Irregular reflection: When the reflecting surface is rough, the parallel rays falling on it are reflected in different direction. Such a reflection is known as diffuse reflection or irregular reflection or even scattering of light. In this, a surface will behave as a smooth surface as long as the surfaces variations are small as compared to the wavelength of incident light. As wavelength of visible light is very small therefore, every surface acts as a rough surface and scattering of light or irregular reflection is more common. For example, any object in a room can be seen from all the parts of the room. This is because surface of the object is rough and it scatters or reflects light in all directions.

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Two types of Reflection : Summary

Reflection of light is the phenomenon of bouncing back of light in the same medium on striking the surface of any object.