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What is optics (Reflection of light) ? And other related terms in physics.

Optics -:

What is optics? And It has mainly 3 contents that is -

-》 Contents -:

1. Reflection of light

2. Refraction and deviation produced by prism

3. . Wave optics (link)

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So we are derived the 1st content of Optics -:

1. Reflection of light - 


  -:  LIGHT

It is an agent which produces in us the sensation of sight. It is a form of energy.
No doubt this definition of light holds good only for a small portion of light, we shall be mainly concerned with light having this property. Various theories regarding the nature of light shall be discussedat appropriate places in this article.

Some terms connected with light.  Some of the following terms shall be more oftenly used during study of Optics.
1. Source.  A body which emits light in all directions is said to be the source of light. The source may be a point one or an extended one. A source is two kinds :
(a) Self luminous.  Self luminous source is the source which possess light of its own. 
(b) Non-luminous.  It is a source of lightwhich does not possess light of its own but receives light froman external sourceand scatters it to the surroundings. 
2. Medium.  Substance through which light propagates or tends to propagate is called medium. It is following three kinds :
(a) Transparent.  It is a medium through which can be propagated easily .
(b) Translucent.  It is a medium through which light is propagated partially.
(c) Opaque.   It is a medium through which light can not be propagated.
3. Ray.  The straight line path along which the light travels in a homogeneous medium is called a ray.

REFLECTION -:

It is the property of light by virtue of which, light is sent back into the same medium from which it is coming after being obstructed by a surface.
Consider a ray SO, incident on a shining surface XY. The ray gets reflected along OI (Fig. 13.1) . We define following terms in connection with the phenomenon of reflection.

LAWS OF REFLECTION -:

Phenomenon of reflection is governed by two laws called laws of reflection, given below :
(i) The incident ray, the reflected ray and the normal to the reflecting surface at the point of incidence, all lie in one plane and that plane is perpendicular to the reflecting surface. 
(i) The angle of incidence is equal to the angle of reflection, i.e.,
/_i = /_r .

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