Reflection Theory

Introduction to Reflection Theory:

When a beam of light is incident on a surface,a part of it is returned back into the same medium.The part of light which is returned back into the same medium is called the reflected light.Thus,

The return of light into the same medium after striking a surface is called reflection.

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Theory of Reflection:

Reflection of light is the process which enables us to see different objects around us. Luminous bodies are directly seen,but non-luminous objects are seen only because they reflect the light incident on them.The reflected light on entering into our eyes,make them visible.

Different surface reflect light to different extents.A highly polished and smooth surface,such as plane mirror,reflects almost the entire light falling on it.

A plane mirror is made by silvering one side of a plane.The surface which is silvered,is called the silvered surface,while the other surface of glass plate is called the reflecting surface from where light is reflected.

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Kinds of Reflection:


There are usually two kinds of reflection:

1)regular reflection and

2)irregular reflection.

1)Regular reflection:Regular reflection occurs when a beam of light falls on a smooth surface and polished surface,such as a plane mirror.A parallel beam of light is incident on a plane mirror,the reflected beam is also parallel and it is in a fixed direction.This is called the regular reflection.

2)Irregular reflection:Irregular reflection occurs when a beam of light falls on a rough surface such as walls of a room or page of a book etc.The walls of a room or page of a book may appear smooth ,but if it examined under a microscope,it appears quite uneven having many small projections. When light rays strike different  parts of a rough surface,the rays are reflected in many different directions and give rise to the diffused or irregular reflections.